Story highlights Trump previously said his Supreme Court pick would come on Thursday

Aides now say they expect it to come sooner

Washington (CNN) President Donald Trump has settled on his first Supreme Court nominee and will reveal his selection Tuesday evening, an announcement that many inside the White House hope could change the subject from a weekend of thundering criticism over the executive order on immigration.

While Trump said last week he would make his choice known on Thursday, he said in a Monday morning message on Twitter that it would come sooner.

"I have made my decision on who I will nominate for The United States Supreme Court. It will be announced live on Tuesday at 8:00 P.M. (W.H.)"

I have made my decision on who I will nominate for The United States Supreme Court. It will be announced live on Tuesday at 8:00 P.M. (W.H.) — Donald J. Trump (@realDonaldTrump) January 30, 2017

The decision to announce his Supreme Court nominee in prime time was Trump's idea, an aide said, in an attempt to draw a larger audience Tuesday evening than he would receive during the day.

It is modeled after President George W. Bush's introduction of John Roberts as an associate justice of the Supreme Court in an evening appearance in the East Room of the White House. Roberts eventually became chief justice.