"Democrats in Congress who oppose a border wall and stay in the way of border security - you are putting all of America's safety at risk, you're doing that," the President said.
The showdown over money for the border wall could come as soon as the end of September, when the Congress is supposed to finish work on the dozen spending bills that fund the operations of the federal government.
But as usual - and this has been true for both parties - those bills are nowhere near being finished by October 1, so lawmakers will have to approve a temporary budget plan to keep the government running.
It's not clear that Mr. Trump - or Republican leaders in the Congress would have even a simple majority of votes in favor of a plan that includes money for the border wall.
Mr. Trump's wide-ranging speech in Arizona touched on a number of other issues:
+ Almost the first 20 minutes was devoted to a defense of his remarks after recent violence in Charlottesville, Virginia, as the President repeatedly blamed the news media for twisting his words on how he views groups like the Ku Klux Klan.
+ The President said he may simply terminate the NAFTA trade deal between the U.S., Canada and Mexico, saying there may not be a way to renegotiate it to the satisfaction of the United States.
+ The President all but said he would give a pardon to former Arizona Sheriff Joe Arpaio, who was convicted of contempt of court, for ignoring a judicial order to stop making immigration sweeps that violated the Fourth Amendment.
+ Mr. Trump spent more time lambasting the news media than making the case for his agenda in Congress, as he called for action by lawmakers on health care, tax reform and infrastructure. While health care legislation remains in limbo, there are still no GOP bills moving forward on either taxes or money to build new roads and bridges.
+ Without mentioning them by name, Mr. Trump called out both of Arizona's U.S. Senators - two Republicans who have crossed swords with the President at times, as Sen. John McCain (R-AZ) doomed a Senate health care bill, as Mr. Trump labeled Sen. Jeff Flake (R-AZ) as "weak" on border and immigration matters.
President Trump goes to Nevada on Wednesday; he will make a speech in Reno at a national gathering of the American Legion, and then sign a new bill to further reforms in the VA.