President Trump will announce that he will use executive action to add a citizenship question on the 2020 Census at a news conference Thursday afternoon, a White House source confirmed to The Post.

The president tweeted that he would address the controversial question in a tweet Thursday morning days after he signaled he was considering using an executive order to include it.

“The White House will be hosting a very big and very important Social Media Summit today. Would I have become President without Social Media?​,” Trump said on Twitter. “Yes (probably)! At its conclusion, we will all go to the beautiful Rose Garden for a News Conference on the Census and Citizenship.​”

Later Thursday morning, the White House updated its daily schedule to add that the president “delivers remarks on citizenship and the census” at 5 p.m.

​Trump brought up the idea that he would include the question using an executive order after the Supreme Court blocked it from next year’s count.

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​​”We’ll see what happens,” ​the president said at the White House last Friday. “We could also add an addition on. So we could start the printing now and maybe do an addendum after we get a positive decision. So we’re working on a lot of things, including an executive order.​”​

​The Supreme Court called the administration’s rationale for including the citizenship question “contrived” and said it ​could not go forward with that reasoning.

Two federal courts have stopped the Justice Department from changing lawyers working on new arguments for its inclusion.