President Donald Trump said he's "stopping an invasion" of the U.S. in a pair of tweets directed at conservative commentator Ann Coulter, whose criticism reportedly helped crystallize his decision to forge ahead with a record long federal government shutdown in December.

Addressing "Wacky Nut Job" Coulter, a former ally, Trump said he's "winning on the Border" and that major sections of the U.S.-Mexico border wall are being built and renovated with more to come. He also tweaked "certain Republicans" for being "sadly unable to fight."

"With another president, millions would be pouring in" to the U.S. through Mexico, Trump said. "I am stopping an invasion" with the effort to use executive action to renovate and construct a new wall on the U.S.-Mexico border, he told Coulter and his 59 million Twitter followers.