Home Depot co-founder Ken Langone told CNBC on Monday that Donald Trump could turn out to be one of America’s best presidents.

If President Donald Trump is able to keep defying expectations — like he did in the election — and push through legislative changes against great odds, he could go down as “one of our greatest presidents ever,” Ken Langone told CNBC on Monday.

Langone, a longtime Republican supporter and the billionaire co-founder of Home Depot, said the Trump presidency offers the GOP, which also controls the House and the Senate, a unique time to deliver on the reasons Americans voted for a political outsider for the White House.

Voters are “fed up,” Langone said on “Squawk Box.” “They did a very dramatic, earth-shattering thing,” and now want results, he said.