The White House on Saturday sent a warning to any Republicans potentially looking to challenge President Trump in 2020.

“The president is as strong as he’s ever been in Iowa, and every potentially ambitious Republican knows that," White House spokeswoman Lindsay Walters told The New York Times for a story about Republicans possibly eyeing a 2020 bid.

The newspaper reported on speculation that several top Republicans could be looking to challenge Trump, who has yet to achieve a major legislative accomplishment and is grappling with the ongoing probe into ties between his presidential campaign and Russia.

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The Times reported that multiple advisers to Vice President Pence, who has kept a packed political schedule, have hinted to party donors that he would plan to run if Trump did not.

Pence is the first sitting vice president to create his own PAC, Great America Committee, and has been cultivating the administration's relationship with top conservative donors, such as brothers Charles and David Koch.

The Times reported vice presidential aide Marty Obst as saying he wanted to be prepared if there was an opening to run in the 2020 race, but when reached for comment, the same aide told the newspaper that the idea Pence was positioning himself for a run was "beyond ridiculous."

Pence's press secretary Marc Lotter issued a tweet calling the claims "fake news."

Claims @VP preparing for 2020 run are ridiculous #FakeNews and nothing more than wishful thinking by New York Times — Marc Lotter (@VPPressSec) August 5, 2017

Ohio Gov. John Kasich (R) has also been seen as someone looking to position himself for a run, given his numerous television appearances and vocal criticism of Trump.

The Times also citied Sens. Ben Sasse (R-Neb.) and Tom Cotton Tom Bryant CottonRenewed focus on Trump's Supreme Court list after Ginsburg's death Republicans call for DOJ to prosecute Netflix executives for releasing 'Cuties' Loeffler calls for hearing in wake of Netflix's 'Cuties' MORE (R-Ark.) — the latter of whom recently partnered with the president on a bill aiming to curb legal immigration — as Republicans potentially mulling a run.