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 (R-Mich.) said Wednesday that the public's view on impeachment “will really depend” on 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’s congressional testimony scheduled for next month.

Amash, the sole House Republican to endorse an impeachment inquiry into President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE, weighed in on news that Mueller is set to testify before the House Judiciary and Intelligence committees on July 17.

While Mueller previously resisted testifying, saying his 448-page report detailed everything he wished to say, Amash said Mueller must go beyond the findings in the report.

"I want to hear him tell the story to the American people," Amash said Wednesday, according to CNN.

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As to whether Mueller’s testimony will affect the public and Congress’s position on impeachment, Amash said, “It will really depend on what he says.”

The comment came the same day Amash broke with his fellow Republicans on the House Oversight and Reform Committee to vote to authorize a subpoena for White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE over allegations she repeatedly violated the Hatch Act.

"With respect to the vote, the point is not whether she is violating the Hatch Act or not, it is whether she should comply with the subpoena," Amash told reporters Wednesday.

Amash’s frequent criticism of Trump has led to a primary challenge from state Rep. Jim Lower (R), who led Amash by double digits in a poll conducted earlier this month by MIRS News. Trump is reportedly considering publicly backing Lower in the primary.

Updated: 5:09 p.m.