Additional U.S. military troops are being deployed to the border with Mexico ahead of an alleged migrant caravan’s approach, President Donald Trump said Thursday.

The announcement came amid a morninglong tweetstorm, but he didn’t specify how many new troops he’s sending.

More troops being sent to the Southern Border to stop the attempted Invasion of Illegals, through large Caravans, into our Country. We have stopped the previous Caravans, and we will stop these also. With a Wall it would be soooo much easier and less expensive. Being Built! — Donald J. Trump (@realDonaldTrump) January 31, 2019

The president suggested a House-Senate border security committee trying to strike a deal and avert another government shutdown is “wasting” its time. In his view, Democrats won’t support funds for his proposed border wall.

In the latest tweet, Trump repeated his contested contention that the structure already is being built. Democratic lawmakers and immigration experts say otherwise.