WASHINGTON After spending months on the sidelines while Congress tried to pass a coronavirus relief bill, President Donald Trump finally inserted himself into the conversation Tuesday night, seemingly with a veto threat, after lawmakers had already reached a deal, passed the bill and left town.

A bill that passed with veto-proof majorities 359-53 in the House and 92-6 in the Senate is now in jeopardy of not becoming law.

I am asking Congress to amend this bill and increase the ridiculously low $600 to $2,000, or $4,000 for a couple, the president said toward the end of a four-minute video he posted on Twitter . Trump also demanded that a tax break for corporate meal expenses, referred to as the triple martini lunch deduction, currently in the bill for two years, be made permanent.

If Congress doesnt send a suitable replacement to his desk, the president said, the next administration will have to deliver a COVID relief package, and maybe that administration will be me.

Trump didnt explicitly use the word veto in his video message, raising the possibility that he may ultimately sign the legislation.

Its an awkward position for lawmakers on both sides. Democrats are positioning themselves with Trump that $600 for most Americans isnt enough money, and they perhaps are hoping they can increase that total, even if it gives Trump a political win.

For Republicans, the situation is even more uncomfortable. It was GOP lawmakers, after all, who objected to increasing the size of direct stimulus checks. And the victory lap that Senate Majority Leader Mitch McConnell (R-Ky.) and Georgia Senate candidates David Perdue and Kelly Loeffler were taking Tuesday has now been interrupted by a temperamental, lame-duck president who has suddenly decided he doesnt like the final product.

Republican senators have made it very clear they do not see the stimulus checks as a priority.

The lone Republican senator who supports bigger stimulus checks, Sen. Josh Hawley of Missouri, found himself partnering with Sen. Bernie Sanders (I-Vt.) to lobby for larger checks.

Its unclear how this shakes out. But House Speaker Nancy Pelosi (D-Calif.) seemed to play along Tuesday night, tweeting that Democrats were ready to bring a $2,000 direct stimulus payment to the floor this week by unanimous consent. It isnt known yet whether Pelosi intends to bring that to the floor separately, apart from the coronavirus and omnibus spending bill package, or as a perfecting amendment to the already-passed measure.

Republicans repeatedly refused to say what amount the President wanted for direct checks, Pelosi tweeted . At last, the President has agreed to $2,000 Democrats are ready to bring this to the Floor this week by unanimous consent. Lets do it!

Senate Minority Leader Chuck Schumer (D-N.Y.) seemed less interested in playing along with Trumps antics.

We spent months trying to secure $2000 checks but Republicans blocked it, Schumer tweeted Tuesday night. Trump needs to sign the bill to help people and keep the government open and were glad to pass more aid Americans need.

Maybe Trump can finally make himself useful and get Republicans not to block it again, Schumer added.

Democrats seem to prefer Congress just overriding Trumps veto or Trump just signing the bill and then going back to the Capitol to secure more stimulus funding.

But there were some eager lawmakers willing to amend the coronavirus bill. Liberal Reps. Alexandria Ocasio-Cortez (D-N.Y.) and Rashida Tlaib (D-Mich.) quickly wrote an amendment to change the $600 stimulus checks to $2,000, and Hawley tweeted that Trump was right and that Congress should add more money.

Some lawmakers, however, didnt seem as entertained by Trumps 10th inning antics, which just so happened to have come within 30 minutes of him pardoning three congressmen who had been convicted of serious crimes (two were the first Republicans in Congress to endorse Trump), a Trump aide who had repeated contact with Russian agents, four Blackwater guards who were involved in a 2007 shooting of civilians in Iraq, a Dutch lawyer found guilty of lying to the Robert Mueller investigation, and two Border Patrol agents convicted of shooting an unarmed border crosser in 2006.

There were rumblings last week that Trump wanted bigger direct payments in the bill. White House aides had to step in and talk him down from demanding up to $2,000 checks, according to a report in The Washington Post .

Trumps sudden veto threat could very well be a distraction from the presidents pardons or a gambit from his Machiavellian chief of staff, Mark Meadows, who is known for selling the president on shoot-the-moon tactics that could backfire spectacularly.

As a congressman, Meadows often talked Trump into situations like this. He got the president to oppose an omnibus bill once in 2018 only to have Trump ultimately sign the legislation once White House aides told him he wouldnt be able to go to Mar-a-Lago for the weekend if the government shut down.

Trumps gamble Tuesday night could easily fail. For one, Congress may just override the veto and make the outgoing president seem even weaker. For another, he may actually just derail the deal and cost most Americans a $600 check or $300 a week in unemployment benefits, and cause a government shutdown.

Part of the reason the coronavirus deal is now imperiled is because lawmakers combined it with the year-end spending bill.

Trump spent a good amount of time conflating the coronavirus relief legislation with criticisms of the government funding bill, which served as the legislative vehicle for the stimulus package and a number of other year-end bills.

He tried to mislead voters by suggesting that corporate handouts many of which were GOP priorities were part of the coronavirus legislation instead of the spending bill.

Even if Trumps gambit to amend the COVID-19 package works, his issues are mostly with the omnibus measure, which may be harder to change.

At the very least, hes stepped on the GOP message that this bill was a huge win for Republicans. Hes undermined McConnells message that Democrats could have had this deal all along. And Trump has put Republicans in the weird position of either going back on their earlier votes or overruling him and upsetting their voters just as Republicans need their voters to turn out in Georgia in order to keep control of the Senate by winning both Jan. 5 runoffs.

If it werent bad enough, Trump later took aim at the Senates No. 2 Republican, tweeting that RINO John Thune, Mitchs boy, should just let it play out. South Dakota doesnt like weakness. He will be primaried in 2022, political career over!!!

(Trump was seemingly referring to his election coup attempts, which Thune has opposed.)

Either way, the presidents erratic behavior threatens a government shutdown. In fact, the only reason the government isnt closed already is because Congress had the foresight to pass a seven-day continuation Monday night instead of just counting on the coronavirus and omnibus spending bill to get to his desk before Tuesday morning.

Trumps out-of-left-field opposition comes just days before Christmas, while nearly all lawmakers are out of town.

Never miss a thing. Sign up to HuffPost Australias weekly newsletter for the latest news, exclusives and guides to achieving the good life.