President Donald Trump said he’s willing to raise the U.S. gas tax to fund infrastructure development and called the tax-overhaul plan he released last week the beginning of negotiations.

“It’s something that I would certainly consider,” Trump said Monday in an interview with Bloomberg News in the Oval Office, describing the idea as supported by truckers “if we earmarked money toward the highways.”

Trump released a tax plan on April 26 that would cut the maximum corporate tax rate to 15 percent from the current 35 percent. The same reduced rate would apply to partnerships and other “pass-through” businesses.

He said he is willing to lose provisions of his tax plan in negotiations with Congress but refused to specify which parts. He also repeated his call for a “reciprocal tax,” which would be aimed at imposing levies on imports to match the rates that each country charges on U.S. exports.