Where have I heard this before?

Washington (CNN)President Donald Trump threatened Sunday to push the government into a shutdown ahead of the coming spending deadline in September if Congress does not fund his border wall and change the nation's immigration laws.  CNN   7/29/2018

President Donald Trump said Wednesday that a government shutdown “could happen” and blamed Democrats for the looming threat, claiming “they want to have illegal immigrants pouring into the country, bringing with them crime."
NBC 12/6/2017

PHOENIX — President Trump on Tuesday threatened to shut down the government over border wall funding, said the North American Free Trade Agreement is likely to be terminated and signaled that he was prepared to pardon former Arizona sheriff Joe Arpaio, who is anathema to the Latino community. Washington Post 8/23/2017

Looming above Washington as Congress and the White House attempt to avert a funding shutdown in only five days’ time, Donald Trump’s central campaign promise to build a wall on the Mexican border threatens to bring the US government to a halt this week in a national display of dysfunction.  The Guardian 4/23/2017

Okay - why did he not shut it down when he controlled both houses of Congress?  Why did he wait until the Democrats controlled the House?  Nah - could not be politics...