Arizona GOP Senate candidate Blake Masters was fiercely rebuked in an open letter penned by former teachers and classmates, along with other alumni from his school.

The Donald Trump -backed Masters will lead Arizona down a dark, dystopian path if he wins election in November, the alumni of Green Fields Country Day School in Tuscon warned in the letter shared by the Arizona Mirror on Thursday.

He peddles extremist ideology attacking veterans, calling abortion demonic, being endorsed by Neo-Nazis, blaming gun violence on Black people, frankly, and thats just the tip of the iceberg, they wrote .

Masters is now barely recognizable from his time at the school, the letter that was signed by 75 people continued, recalling he was kind.

We are deeply grieved to see the Blake we knew for two decades become the dangerous politician he is today, they added. We cannot sit idly by while his dishonesty, his selfishness, and his hateful, divisive rhetoric become the voice of Arizona in the U. S. Senate.

Masters was endorsed by Trump in the primary and is now facing current Sen. Mark Kelly (D-Ariz.). Previously, the best man at Masters wedding condemned his rhetoric.

Read the full open letter here.