Rep. Mike Quigley Michael (Mike) Bruce QuigleyDemocrats introduce legislation to revise FDA requirements for LGBT blood donors Tucker Carlson sparks condemnation with comments about deadly Kenosha shooting Hillicon Valley: Three arrested in Twitter hack | Trump pushes to break up TikTok | House approves 0M for election security MORE (D-Ill.) on Monday criticized President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE for resorting to "juvenile name-calling" by attacking Rep. Adam Schiff Adam Bennett SchiffPelosi, Democrats unveil bills to rein in alleged White House abuses of power Chris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer MORE (D-Calif.) as "little Adam Schitt."

"I feel like I’m back in seventh grade here, where we have juvenile name-calling. This is important stuff. We’re talking about protecting the rule of law, and the best the president can do is start calling people names," Quigley, a member of the House Intelligence Committee, said on CNN's "New Day."

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Trump on Sunday blasted Schiff, the likely incoming chairman of the House Intelligence Committee, after the congressman appeared on a Sunday talk show and raised questions about acting Attorney General Matthew Whitaker overseeing the special counsel investigation.

Quigley said the committee must be focused on protecting Mueller, restoring the relationship with the intelligence community and working on a bipartisan basis.

"In the midst of all this, the president resorts to such actions," he said. "It’s extraordinary."

Trump has clashed with Schiff repeatedly over the past two years, though Sunday was the first time he appeared to intentionally misspell the lawmaker's name. Rep. Pete King Peter (Pete) KingTrump holds private funeral service for brother Robert Trump at White House Cheney clashes with Trump Coronavirus Report: The Hill's Steve Clemons interviews Rep. Sean Patrick Maloney MORE (D-N.Y.), asked about the incident in a separate interview Monday morning on Fox News, said he wished the president had not made the comment.

Democrats have raised concerns about Trump's decision to appoint Whitaker to replace Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE as attorney general. Whitaker has spoken and written critically about the special counsel's investigation, suggesting that the attorney general could stifle funding and that its scope should be limited.

Trump said in an interview broadcast Sunday that he was unaware of those comments before picking Whitaker for the post.