Washington DC - Texas Republican Tony Gonzales has announced he will retire from Congress amid mounting pressure after acknowledging an affair with a former aide who later died by self-immolation.

"There is a season for everything and God has a plan for us all," Gonzales said in an X post.

"When Congress returns tomorrow, I will file my retirement from office. It has been my privilege to serve the great people of Texas."

House Speaker Mike Johnson and other Republican leaders had already urged him not to seek re-election.

Gonzales' resignation came just hours after Democrat Eric Swalwell of California, who had already ended his bid to become governor, announced his exit from Congress after multiple women accused him of sexual assault or misconduct.

Lawmakers are still zeroing in on separate controversies involving two Florida lawmakers – Democrat Sheila Cherfilus-McCormick and Republican Cory Mills – in an unusual push for disciplinary action.

"Congress should not tolerate representatives who abuse staff, betray public trust for personal gain, and generally violate their oath of office," New York Democrat Nydia Velazquez posted on X, calling for all four to resign and adding, "if they refuse, they should be expelled."

Expulsion from the House requires a two-thirds majority, a threshold so high that Congress has wielded the sanction only in the gravest cases, removing just six members in its 237-year history.

Republican Anna Paulina Luna had been set to introduce a resolution Tuesday to expel Swalwell, and support for votes to oust the other three, beginning as early as this week, has come from an ideologically wide group of lawmakers.

"These allegations are despicable, and they demean the integrity of Congress," Florida Republican Byron Donalds told NBC, adding that both Swalwell and Gonzales "need to go home."

The Swalwell and Gonzales cases in particular have fed talk on Capitol Hill of a politically symmetrical purge: one Democrat for one Republican, or perhaps two from each party.

"Gonzales and Swalwell exploited their staffers' ideals and commitment to public service as a vulnerability. These staffers work incredibly hard and instead of being treated with respect, they were preyed upon," Democratic New Mexico Congresswoman Teresa Leger Fernandez said.

Cherfilus-McCormick is already facing a sanctions hearing after an Ethics Committee subpanel found she committed 25 violations tied to campaign finance and related conduct, and she is also due to face a federal criminal trial next year.

Cherfilus-McCormick has denied wrongdoing and pleaded not guilty in her criminal case.

The Ethics Committee, a bipartisan but notoriously slow-moving body that handles misconduct cases in the House, was investigating Gonzales and on Monday opened a new file, on Swalwell – but the committee's jurisdiction only extends to sitting members.

Mills, meanwhile, is under investigation over allegations ranging from sexual misconduct and domestic violence to campaign finance and gift violations, all of which he denies.

Many lawmakers remain skeptical the chamber will act as soon as this week.

The House is already operating with an exceptionally thin Republican majority, and any vacancies would trigger special elections whose timing would depend on state governors.