Republican strategist Karl Rove said Friday that President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE would be wise to spend 2018 focusing on his agenda, rather than campaigning leading up to the midterms.

In an interview on Fox News, Rove said that Trump has enjoyed a boost in his popularity in recent days because of his focus on tax reform. By putting an emphasis on his policy agenda, Rove argued, Trump could turn around his low approval ratings.

"He's not very popular and the way to become more popular is to become less political and more involved in his agenda," said Rove, a former senior aide to President George W. Bush.

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Trump is fresh off the first major legislative victory of his presidency after congressional Republicans passed a sweeping rewrite of the nation's tax code this week. The president signed that measure into law on Friday.

For most of his first year in office, Trump has suffered dwindling approval ratings, which Rove attributed to the president's off-the-cuff attacks against critics and political opponents, as well as his bombastic, combative rhetoric.

Trump has relished campaign-style rallies, even after taking office this year. He often uses the events to tout his victory in the 2016 election and boast about his Electoral College win.

The Washington Post reported that Trump met earlier this week with his former White House chief of staff Reince Priebus Reinhold (Reince) Richard PriebusLeaked audio shows Trump touted low Black voter turnout in 2016: report Meadows joins White House facing reelection challenges Trump names Mark Meadows as new chief of staff MORE, the former head of the Republican National Committee, to discuss the 2018 midterms.

"The president ought to spend 2018 focusing on his job as president and advancing an agenda that makes a difference in the lives of ordinary Americans, and he should downplay politics," Rove said on Fox.