U.S. Sen. Pat Toomey, a Lehigh Valley Republican, on Monday announced he will call it quits in 2022 after a combined total of 18 years in Congress.

At a news conference near his home in suburban Allentown, Toomey said he will serve out the final two years of his second term, “and after that my plan is to go back to the private sector.”

“I always thought that I’d probably serve just two terms and often mentioned that along the way,” Toomey said at the news conference, attended by his wife and family.

Toomey is Pennsylvania’s sole Republican to hold elective office outside of the state courts. He served three terms in the U.S. House of Representatives before being elected to two terms in the Senate. He said 18 years is enough.

He also said will not run for governor in 2022, when Gov. Tom Wolf’s second and final term ends. Toomey’s announcement likely will trigger a scramble among the state GOP.

In making his announcement, Toomey made good on his prior commitment to term limits. In 2015, he co-sponsored a failed measure to amend the U.S. Constitution to limit members to three terms in the House and two terms in the Senate.

“Term limits would encourage more people to run for office, and produce a more diverse group of representatives with valuable real-world experiences,” he said at the time.

Toomey, a fiscal conservative who has taken issue with President Donald Trump on some tariff and trade measures, said he is supporting the president’s re-election campaign and believes the Senate will be able to vote on the nomination of Amy Coney Barrett to the U.S. Supreme Court prior to the Nov. 3 election.

Toomey is a stalwart proponent of free markets and smaller government who was staunchly supported in the past by the billionaire industrialists Charles and David Koch and the Club for Growth, the take-no-prisoners free-markets advocacy group that Toomey once led.

But Toomey had often expressed frustration with how the Senate operates and had never promised to run for a third term. Still, the news of his future plans that broke Sunday has reshuffled the deck for Republicans looking ahead to the two major statewide races in two years.

Toomey had long expressed an interest in running for governor, and he said his decision to announce he would not be running for anything in 2022 was prompted by calls from people seeking to help him run for Senate or governor.

His family remained in Pennsylvania while he served in Congress, Toomey said.

“I’m looking forward to more time back at home,” he said.

The Associated Press contributed.