President Trump on Thursday said the 115th Congress might be the busiest ever, and said unlike former President Obama, he would sign much of what Congress delivers into law.

"This Congress is going to be the busiest Congress we've had in decades, maybe ever," Trump told the Republican retreat in Philadelphia.

"Think of that. And think of everything we can achieve, and remember who we must achieve it for," he said. "We're here now because tens of millions of Americans have placed their hopes in us, to transfer power from Washington, D.C. and give it back to the people."

Trump thanked House Speaker Paul Ryan, R-Wis., and Senate Majority Leader Mitch McConnell, R-Ky., and told them the White House would no longer be a legislative graveyard.

"We're actually going to sign the stuff that you're writing, you're not wasting your time," he said.

Trump was greeted warmly by Republicans, who hadn't had a president attend one of their retreats in a decade.

"Nice to win, do we agree?" Trump asked to applause. "It's been a while."