But he admitted to unspecified failings in his statement.
“I am deeply sorry to my family, staff, and constituents for mistakes in judgment I’ve made in my past,” Swalwell said.
“I will fight the serious, false allegation made against me. However, I must take responsibility and ownership for the mistakes I did make.”
His resignation marks a remarkable fall from grace.
By Saturday, he had dropped out of that race after news broke of his alleged behaviour.
He had made an unsuccessful bid for president in 2020.
Today’s announcement of his resignation came after one of his closest friends called for his expulsion.
“I want to be clear: I had no knowledge of the allegations of assault, harassment, and predatory behaviour against Eric Swalwell,” Senator Ruben Gallego said.
“I trusted someone who I believed was a friend, but it is now clear that he is not the person I thought I knew.
“The women who have come forward have shown courage. They deserve to be believed, to be supported, and to see justice served.”
While Swalwell said he will resign as the representative for California’s 14th District, he has yet to officially do so.
Under California law, it is possible his seat will not get filled under the general election in November.
In any instance, it is highly likely the seat in California’s Bay Area will be won by a Democrat.
Soon after Swalwell announced his resignation, a Texas Republican beset by scandal also said he would leave office.
“There is a season for everything and God has a plan for us all,” Tony Gonzales said in a statement.
“When Congress returns tomorrow, I will file my retirement from office.
“It has been my privilege to serve the great people of Texas.”
Gonzales had admitted to having an affair with a staffer who later committed suicide.
His statement did not specify when he would leave office, having dropped his re-election bid several weeks ago.
Both Gonzales and Swalwell were facing votes from their colleagues that would expel them from the House.
Firebrand conservative House member Anna Paulina Luna celebrated the resignations of both members.
“We have successfully drained part of the swamp this week with the resignation of two very corrupt members of Congress,” she said.
While Swalwell’s seat would likely be filled by a Democrat, Gonzales’ seat is not a sure thing for Republicans.
The district, which stretches along the border from El Paso to San Antonio, has been represented by Democrats in recent memory.
A massive swing in South Texas to Republicans in recent years may be reversed, if voter turnout in last month’s primary elections were any indication.
