Gov. Andrew Cuomo said Tuesday he was as puzzled as anyone by President Trump’s Saturday morning tweet pledging to help build the Second Avenue Subway — so he put in a call to US Secretary of Transportation Elaine Chao.

Trump on Saturday tweeted: “Looking forward to helping New York City and Governor @andrewcuomo complete the long anticipated, and partially built, Second Avenue Subway,” but Cuomo’s office said at the time there was no funding agreement with the feds.

On Tuesday morning, Cuomo told reporters, “I haven’t heard anything from anyone, so it’s just another tweet as far as I’m concerned” and that he’d put in a call to Chao but hadn’t heard anything back.

Chao and Cuomo finally got on the phone on Tuesday afternoon and discussed a “wide range of issues,” a federal transportation official told The Post. Cuomo’s office did not immediately confirm the phone call.

The state-run Metropolitan Transportation Authority hopes to get around $2 billion in federal assistance from the Department of Transportation for the next leg of the Second Avenue Subway, which is expected to cost three times that much.

The endeavor will add stops at 106th Street and Second Avenue, 116th Street and Second Avenue, and 125th Street and Lexington Avenue.

The first leg of the project — which extended the Q train three stops from 63rd Street to 96th Street — opened on Jan. 1, 2017. At $2.5 billion per mile, it was the most expensive transit project in history — a record that phase two is expected to shatter.

Trump’s tweet — sent off during his G-7 visit to Europe — came the day after the Port Authority submitted a request for federal funding for its multibillion-dollar Hudson River tunnel project, a priority of both the governor’s and Sen. Chuck Schumer’s.

A funding deal wasn’t expected until 2020, but an MTA source said transit officials are hopeful Trump’s tweet means an expedited timeline.