Sen. Lindsey Graham, R-South Carolina, said that President Trump has “got to do it on his own” to build a border wall in an interview with CBS “Face the Nation” on Sunday.

The president dissatisfied with the $1.375 billion Congress provided him for barriers at the southern border. Trump on Friday declared a national emergency to gain more funds to construct border barriers.

“Unfortunately, when it comes to Trump, the Congress is locked down and will not give him what we’ve given past presidents,” Graham said. “So unfortunately, he’s got to do it on his own, and I support his decision to go that route.”

Graham noted that former Presidents George Bush and Barack Obama sent troops to the border. He said that many in Congress only oppose the wall because Mr. Trump is the person proposing it.

Graham also discussed Mr. Trump’s comment Friday that he “didn’t need to” call the national emergency, but he did so because he would “rather do it much faster.”

“I think the president’s been making a persuasive case that those borders [are] broken. Drugs are flowing across the border killing Americans, [there is] human trafficking. We’ve got a dangerous situation along the border,” Graham said. He added that the president has the authority to send troops to the border and build barriers while they are deployed.

“I support his desire to get it done sooner rather than later. And I’m disappointed that my Democratic colleagues would not give the President the money to secure the border that they were willing to give the Bush and Obama,” he said.

Democratic attorneys general and groups like the American Civil Liberties Union (ACLU) have threatened to file suit against the declaration. House Speaker Nancy Pelosi didn’t rule out a legal challenge on Thursday. Mr. Trump predicted he will be sued but will ultimately prevail in the Supreme Court.

Mr. Trump is expecting to use $8 billion to build the wall, including the $1.375 billion approved by Congress, with an additional $600 million expected to come from the Treasury Department’s drug forfeiture funds, $2.5 billion coming from the Defense Department’s drug interdiction program, and an additional $3.5 billion coming from the Pentagon’s military construction budget.