President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE in early morning tweets on Sunday called Mexico "an 'abuser' of the United States," warning that threatened tariffs would force companies to move back to the U.S. if nothing is done to stop illegal immigration.

"People have been saying for years that we should talk to Mexico. The problem is that Mexico is an 'abuser' of the United States, taking but never giving. It has been this way for decades," he said.

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"Either they stop the invasion of our Country by Drug Dealers, Cartels, Human Traffickers, Coyotes and Illegal Immigrants, which they can do very easily, or our many companies and jobs that have been foolishly allowed to move South of the Border, will be brought back into the United States through taxation (Tariffs)," he added. "America has had enough!"

People have been saying for years that we should talk to Mexico. The problem is that Mexico is an “abuser” of the United States, taking but never giving. It has been this way for decades. Either they stop the invasion of our Country by Drug Dealers, Cartels, Human Traffickers.... — Donald J. Trump (@realDonaldTrump) June 2, 2019

Trump last week announced that Mexico would face gradually steeper tariffs until the flow of migrants to the southern U.S. border stopped or was significantly reduced.

Trump early Sunday also knocked Democrats, urging them to "vote with Republicans to fix the loopholes" without providing specifics.

The Democrats are doing nothing on the Border to address the Humanitarian and National Security Crisis! Could be fixed so easily if they would vote with Republicans to fix the loopholes. — Donald J. Trump (@realDonaldTrump) June 2, 2019

Trump went on to dismiss a series of lawsuits by progressive organizations and state attorneys general to prevent the White House from diverting military funds to build a wall on the southern border.

"What are they thinking as our Country is invaded by so many people (illegals) and things (Drugs) that we do not want," Trump tweeted.

The Wall is under construction and moving along quickly, despite all of the Radical Liberal Democrat lawsuits. What are they thinking as our Country is invaded by so many people (illegals) and things (Drugs) that we do not want. Make America Great Again! — Donald J. Trump (@realDonaldTrump) June 2, 2019

Last Thursday, a federal judge rejected the administration's request to begin building the wall using Pentagon funds while it appeals an earlier order blocking the use of the funds.

The White House wrote in its filing that "unless stayed, the Court’s injunction will irreparably harm the Government (and the public) by prohibiting the Government from taking critical steps to stop the flow of illegal drugs from entering the country through the southern border."

The administration has said it will appeal the latest ruling to the 9th Circuit Court of Appeals.

Zack Budryk contributed to this report, which was updated at 8:25 a.m.