Grassley to Trump: You can't let McGahn leave

Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyOvernight Health Care: Dem chair plans hearing on Medicare for all | Senate GOP talks drug prices with Trump health chief | PhRMA CEO hopeful Trump reverses course on controversial pricing proposal IRS waiving penalty for some in first filing season under Trump's tax law HHS secretary, Senate Finance Republicans talk drug pricing MORE (R-Iowa) on Wednesday pushed back on President TrumpDonald John TrumpPentagon update to missile defense doctrine will explore space-base technologies, lasers to counter threats Giuliani: 'I never said there was no collusion' between the Trump campaign and Russia Former congressmen, RNC members appointed to Trump administration roles MORE's announcement that White House counsel Don McGahn would leave in the fall, saying "I hope it's not true."

Grassley, who chairs the Senate Judiciary Committee, responded to Trump's abrupt announcement that McGahn would leave in the coming weeks, writing on Twitter that the president "can't let that happen."

Trump wrote in a tweet Wednesday morning that McGahn would leave the White House after Supreme Court nominee Brett Kavanaugh's expected confirmation.

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Grassley's panel is in charge of Kavanaugh's confirmation hearings, which are slated to kick off starting next month. 

"White House Counsel Don McGahn will be leaving his position in the fall, shortly after the confirmation (hopefully) of Judge Brett Kavanaugh to the United States Supreme Court. I have worked with Don for a long time and truly appreciate his service!" Trump wrote earlier Wednesday.

Grassley's tweet was met with a response minutes later from George Conway, husband of White House counselor Kellyanne ConwayKellyanne Elizabeth ConwayTrump’s polls sag amid wall fight George Conway: Nothing Trump says 'can be taken at face value' Sarah Sanders and CNN's Acosta trade barbs over border visit MORE and a frequent critic of the president. He joked that McGahn's continued service would amount to "excessive .. punishment" under the Constitution's Eighth Amendment.

"Remember the eighth amendment, senator," Conway wrote.

News of McGahn's expected resignation comes weeks after The New York Times reported that he had cooperated extensively with special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE's investigation into Russia's election interference.

The Times reported that McGahn gave detailed accounts for the special counsel probe, including on the question of whether Trump obstructed justice by firing former FBI Director James ComeyJames Brien ComeyFISA shocker: DOJ official warned Steele dossier was connected to Clinton, might be biased Dems demand access to interpreters at Trump's meetings with Putin Kremlin official: ‘Stupid’ to think Trump is working for Russia MORE.

Trump responded to the report by claiming that he had instructed McGahn to cooperate personally, adding that no obstruction of justice had occurred.

“I allowed White House Counsel Don McGahn, and all other requested members of the White House Staff, to fully cooperate with the Special Counsel,” Trump tweeted earlier this month. “In addition we readily gave over one million pages of documents. Most transparent in history. No Collusion, No Obstruction. Witch Hunt!” he tweeted earlier this month.