White House press secretary Sarah Huckabee Sarah Elizabeth SandersSarah Sanders on Trump's reported war dead criticism: 'Those comments didn't happen' Sarah Sanders memoir reportedly says Trump joked she should hook up with Kim Jong Un McEnany stamps her brand on White House press operation MORE Sanders on Wednesday dismissed comments from Republican Rep. Justin Amash Justin AmashInternal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president MORE (Mich.), who doubled down on his calls for impeachment following remarks from special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE.

“I don't think Congressman Amash is worth the time of the White House,” Sanders told reporters.

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Earlier Wednesday, Amash said that Mueller's first public remarks on his investigation into Russian interference in the 2016 election signal that Congress should begin impeachment proceedings.

Amash, the lone congressional Republican to call for impeachment, has become a thorn in the side for the White House. After Mueller said indicting Trump was “not an option” because of Justice Department guidelines, the Michigan congressman tweeted, “The ball is in our court, Congress.”

Sanders would not say if Trump would back a primary challenge against Amash, saying she will "let the president make that determination.”

Mueller's Wednesday comments sparked impeachment calls among a number of Democrats, many of whom had previously declined to go that far in their comments.

The special counsel said his team concluded that they could not bring obstruction of justice charges against Trump due to Justice Department guidance stating that a sitting president can't be indicted.

Mueller also reiterated that while his report "does not conclude that the president committed a crime, it also does not exonerate him."

"After that investigation, if we had had confidence that the president clearly did not commit a crime, we would have said so," Mueller said.