Texas Republican Rep. Brian Babin is asking for congressmen to sign onto a letter requesting that special counsel Robert Mueller appear publicly in a congressional hearing, The Daily Caller has learned.

Mueller, who is investigating Russian election interference and possible ties between the Kremlin and the Trump campaign, has come under intense criticism from allies of President Donald Trump for hiring attorneys who have donated to Democratic candidates and for his personal relationship with former FBI Director James Comey. Trump himself has called Mueller’s employment of Democratic donors “ridiculous,” yet he maintains that he has no plans to dismiss the special counsel.

Babin’s letter, which was obtained by TheDC, was sent out to congressmen Thursday and asks for members to cosign a letter he plans to send to House Judiciary chairman Bob Goodlatte and Senate Judiciary chairman Chuck Grassley. (RELATED: Mueller Hires Yet Another Democratic Donor)

“Every nominee for United States Attorney must be confirmed by the Senate, a process that brings to the forefront any concerns regarding the nominee’s ability to hold their position in a decent and impartial manner. However, as Special Counsel Robert S. Mueller III and his team of lawyers investigate our very own president, we as a nation wait in the dark with very little information about those given this great authority,” Babin wrote in the letter to his fellow representatives.

Babin writes in the letter that there are “serious concerns” about conflicts of interest with regard to members of Mueller’s counsel who donated “generously” to Democrats or even represented Clinton herself.

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“In addition, this investigation has the potential to drag on for months, or even years, and cost millions in taxpayer dollars,” Babin added.

Babin’s goal is to have one or both of the judiciary committees “bring Mr. Mueller and his team out of the shadows” to answer questions about the “potential expenses incurred by Mr. Mueller, the scope of his investigation and the selection of his special council team.” (RELATED: They Don’t Like Him, But Key Trump Allies Think Mueller Should Keep His Job)

No congressmen have signed onto the letter so far, which Babin is keeping open for support until Sept. 6.

Arizona Republican Rep. Trent Franks recently said that Mueller is in “clear violation” of federal law due to his reported friendship with Comey and added that due to this conflict of interest Mueller has to resign.

Jimmy Milstead, a spokesman for Babin, told TheDC, “We don’t see why there shouldn’t be very strong support.”