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 Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE's "retaliation" against Lt. Col. Alexander Vindman Alexander VindmanImpeachment witness Alexander Vindman calls Trump Putin's 'useful idiot' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Strzok: Trump behaving like an authoritarian 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.