WASHINGTON (Reuters) - U.S. President Donald Trump repeated on Tuesday that immigration authorities would next week target migrants in the country illegally in large-scale arrests, but still gave no details about the planned action.

"They're going to start next week, and with people coming to our country, and they come in illegally - they have to go out," he told reporters at the White House before a trip to Florida where he will formally launch his re-election campaign. Trump also praised Mexico for action he said it has taken to stem the flow of immigrants to the United States.