(Reuters) - Businessman and reality TV personality Donald Trump will endorse former House Speaker Newt Gingrich for the 2012 Republican presidential nomination Thursday, several media outlets reported Wednesday night.

Sources close to the Gingrich campaign confirmed Trump would endorse Gingrich, according to several television and newspaper reports.

Trump's announcement will come two days before the Republican caucus in Nevada, the next state in the party's presidential nominating contest, the reports said.

A spokesman for the Gingrich campaign was not immediately available for comment.

A Trump adviser said earlier Wednesday that Trump planned to make major announcement in Las Vegas on Thursday about the presidential race.

Trump last year flirted with a presidential run as a Republican and was derided for pushing the discredited charge that President Barack Obama might not have been born in the United States.

He left the Republican Party in December after a presidential debate he'd planned to host fell through.

(Reporting by JoAnne Allen; Editing by Eric Walsh)