President Trump was saddened to learn Sen. Orrin Hatch, R-Utah, does not plan to run for re-election in 2018, White House press secretary Sarah Sanders said Tuesday.

Trump "has the greatest and deepest amount of respect for Sen. Hatch" and was "very sad to see Sen. Hatch leave," Sanders told reporters at the White House.

Sanders said Trump has not yet decided who, if anyone, he would support in the race to fill Hatch's seat this year.

"Obviously, I don't think we've made a determination in terms of campaigning," she said.

Hatch put an end to months of speculation by announcing on Tuesday his plans to forego a re-election bid after decades of service on Capitol Hill.

Mitt Romney, a former GOP presidential nominee, is rumored to be considering a campaign for Hatch's seat.