Rove -- who sources said advised the White House and Trump campaign leading up to the 2020 election -- wrote in a Wall Street Journal op-ed that while the President is within his right to challenge the results, his efforts "are unlikely to move a single state from Mr. Biden's column, and certainly they're not enough to change the final outcome."
To prevail, Rove wrote, Trump would need to "prove systemic fraud, with illegal votes in the tens of thousands. There is no evidence of that so far. Unless some emerges quickly, the President's chances in court will decline precipitously when states start certifying results."
"Closing out this election will be a hard but necessary step toward restoring some unity and political equilibrium," he added. "Once his days in court are over, the President should do his part to unite the country by leading a peaceful transition and letting grievances go."
The op-ed makes Rove one of the highest profile GOP figures to encourage the President to accept the results of the election. Since CNN and other outlets called the election for President-elect Joe Biden on Saturday, Trump has refused to accept the results, instead pushing baseless conspiracies that his second term is being stolen.
In court, Republicans and the Trump campaign have lodged none of the types of serious legal challenges that could prompt recounts or challenges of vote counts over a significant numbers of ballots in the battlegrounds of Pennsylvania, Michigan, Nevada, Arizona and Georgia.
In order to use the courts to win the presidential election, the Republicans and Trump campaign would need to challenge enough votes in court to flip a state they're losing in their favor.
"That's a standard they haven't been close to meeting yet," Ben Ginsberg, a longtime Republican lawyer and CNN analyst, told CNN's Jake Tapper.
Still, Trump implied Tuesday he would continue contesting the results for at least another week.
And the White House, while offering little formal or explicit guidance, has nonetheless made known throughout the federal government that no steps should be taken that would imply Trump lost the election, according to people familiar with the matter.