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 TrumpCDC updates website to remove dosage guidance on drug touted by Trump Trump says he'd like economy to reopen 'with a big bang' but acknowledges it may be limited Graham backs Trump, vows no money for WHO in next funding bill MORE's "retaliation" against Lt. Col. Alexander VindmanAlexander VindmanTrump takes heat for firing intel watchdog during pandemic America's diplomats deserve our respect White House withdraws nomination for Pentagon budget chief who questioned Ukraine aid hold 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.