READ: Schumer's letter accusing Trump of 'pattern of retaliation' against whistleblowers

Senate Minority Leader Charles Schumer (D-N.Y.) on Monday wrote to 74 inspector generals asking for "immediate action to investigate any and all instances of retaliation" against whistleblowers.

He cited President TrumpDonald John TrumpBiden says his faith is 'bedrock foundation of my life' after Trump claim Coronavirus talks on life support as parties dig in, pass blame Ohio governor tests negative in second coronavirus test MORE's "retaliation" against Lt. Col. Alexander VindmanAlexander VindmanVindman describes 'campaign of bullying, intimidation and retaliation' by Trump, allies in op-ed Vindman marks 1 year since call that led to Trump's impeachment White House officials alleged Vindman created hostile work environment after impeachment testimony: report MORE following his testimony in Trump's impeachment trial.

Vindman was removed from his position from the White House last week in a move his attorney called "revenge." The White House said Vindman was returning to his full-time job after a temporary assignment at the National Security Council.

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"These attacks are part of a dangerous, growing pattern of retaliation against those who report wrongdoing only to find themselves targeted by the President and subject to his wrath and vindictiveness," Schumer wrote.

Read Schumer's letter to the acting inspector general for the Department of Defense below.