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.) officially submitted his letter to leave the House Republican Conference on Monday, losing his committee assignment as a result.

“Today, I sent the attached letter to Republican leaders as formal notification that I am withdrawing my membership in the House Republican Conference and, consistent with House rules, resigning from the Committee on Oversight and Reform,” he tweeted.

Today, I sent the attached letter to Republican leaders as formal notification that I am withdrawing my membership in the House Republican Conference and, consistent with House rules, resigning from the Committee on Oversight and Reform. pic.twitter.com/8x8lFUmaGY — Justin Amash (@justinamash) July 8, 2019

In the letter addressed to House Minority Leader Kevin McCarthy Kevin Owen McCarthyMcCarthy says there will be a peaceful transition if Biden wins GOP lawmakers distance themselves from Trump comments on transfer of power McCarthy claims protests in Louisville, other cities are 'planned, orchestrated events' MORE (R-Calif.) and House Republican Conference Chairwoman Liz Cheney Elizabeth (Liz) Lynn CheneyGOP lawmakers distance themselves from Trump comments on transfer of power Graham vows GOP will accept election results after Trump comments Liz Cheney promises peaceful transfer of power: 'Fundamental to the survival of our Republic' MORE (R-Wyo.), Amash wrote, "Please accept this letter as formal notification that I am withdrawing my membership in the House Republican Conference, effective immediately, for the reasons outlined in my accompanying op-ed."

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"Consistent with Clause 5(b) of Rule X of the Rules of the House of Representatives, I also am resigning from the Committee on Oversight and Reform," he added.

Congressional rules make sitting on a standing committee contingent on being a member of a party and being nominated by the party to serve on the panel.

Amash has been inching away from the Republican Party, ripping 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 and calling for his impeachment.

In a July 4 op-ed in The Washington Post, he announced his “independence” from the party.