Barnaby Joyce says he will resign as Australia's deputy prime minister following a politically damaging saga that began with his affair with a former staffer.
Mr. Joyce said he would step down on Monday as leader of the Nationals, the junior government partner.
He had previously resisted calls to quit amid intense scrutiny over his ministerial conduct.
The scandal has dominated Australian headlines for more than two weeks.
He described his decision on Friday as a "circuit-breaker" for his family and new partner.
"This current cacophony of issues has to be put aside," he told reporters.
Prime Minister Malcolm Turnbull issued a statement shortly after thanking Mr. Joyce for being a fierce advocate for rural and regional Australia".
Mr Joyce has built a prominent profile during a parliamentary career that began in 2004.
The outspoken politician is perhaps best-known for once threatening to kill Johnny Depp's dogs over a quarantine violation, and for briefly losing his job over his New Zealand dual citizenship last year.
A leading conservative, he represented rural voters as leader of the National party.
Mr. Joyce said he faced a "litany of allegations" in the weeks after a newspaper exposed his relationship with Vikki Campion, his former media adviser. He has repeatedly denied breaching ministerial standards.
Political opponents questioned him after two unadvertised jobs within his party were taken up by Ms. Campion last year, and over whether he sought a gift of free housing from a businessman.
He also vigorously denied a sexual harassment complaint that was made against him by another woman.
Last week, he sparred publicly with Mr. Turnbull after the PM criticised his "shocking error of judgment" and declared that ministers would be banned from having sex with their staff.
Mr. Joyce said Mr. Turnbull's comments had "caused further harm" but insisted the pair could still work together.
Marriage Breakdown
Mr. Joyce has previously apologized to his estranged wife Natalie Joyce, four daughters, and Ms. Campion, for the public manner in which the scandal has played out.
He has described the breakdown of his marriage as one of "the greatest failures of my life", while Mrs. Joyce told media the situation was "devastating".
On Friday, Mr. Joyce said he hoped his decision would help his family.
"This has got to stop. It's not fair to them," he said.