WASHINGTON — The White House wasted no time Friday attacking Cory Booker after he announced for the presidency, with Kellyanne Conway questioning why he’s entering a race with so many female candidates.

“What’s wrong with the candidates that are already in there?” Conway asked during an interview with Fox News. “What’s your objection to Kamala Harris running, Elizabeth Warren, Kirsten Gillibrand, these others who have already announced — Tulsi Gabbard, maybe.”

“If he were a Republican running against them, they would immediately call him a sexist for running against these women in the Democratic field,” she said.

Criticizing Booker, Conway echoed comments President Trump made to The Post during an Oval Office sit-down in November.

“The president said before that Cory Booker as mayor of Newark ran the city into the ground, so I’ll let those comments stand,” the White house counselor later told reporters.

In his interview with The Post, Trump predicted Booker was “not going to be a problem” for him to beat.

Conway mocked Booker’s soaring rhetoric, saying he sounded “like a Hallmark card.” Conway, a fellow New Jersey native, suggested he didn’t have much of a record from his time serving in the US Senate — he was sworn in in 2013 — and as Newark mayor, a position he held for eight years.

“We’ll wait to look at his record,” she said. “I imagine that the crowded Democratic field of presidential aspirants will be attacking each other’s records or lack thereof, so we’ll be sitting back with copious bowls of popcorn watching that.”