Rep. Trent Franks, R-Ariz., is expected to resign his congressional seat.
According to Arizona state law, the governor will have to call a special election to fill the seat as Franks' resignation would come more than 6 months before the next general election.
One Arizona Republican reportedly said not many people would be "surprised" if he resigned.
Franks told reporters he would release a statement explaining his decision to step down.
Franks is also a member of the House Freedom Caucus, a hard-right faction that has often clashed with Republican leaders.
Earlier Thursday, liberal Sen. Al Franken announced that he would be resigning "in the coming weeks" after several women alleged the 66-year-old had behaved aggressively and inappropriately toward them.
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Thursday evening Franks declined to confirm to a gaggle of reports that he plans to resign.
"Half of all black children are aborted", Franks infamously said in 2010.
He's a strong backer of President Donald Trump and has embraced some of his stances on social issues.
Franks represents Arizona's 8th district and first entered Congress in 2002.
There is no word on who could replace Franks at this time.
Before winning election to Congress, he served in the Arizona legislature and founded the Arizona Family Research Institute, an organization associated with Dr. James Dobson's "Focus on the Family".