Senator Lindsey Graham Claims Trump Border Wall Is Defense Against 'Radical Islam'

South Carolina Senator Lindsey Graham claimed that President Donald Trump's proposed wall along the U.S.-Mexico border was part of America's defense against terrorism and part of a global strategy against "radical Islam."

Writing on Twitter on Thursday, the senator said the as-yet incomplete border fortifications would form America's "last line of defense" against radical Islamists but offered no evidence that Islamic extremists had ever used the Mexican border to infiltrate the U.S.

Read More: Fox News anchor predicts Trump's border wall "is never going up": "Mark my words... It's not happening"

"When it comes to radical Islam, a border wall is our last line of defense—not our first," the Republican senator wrote. "Our first line of defense is a forward-deployed presence working with partners to disrupt enemy operations directed at our allies and homeland."

The message blended support for Trump's contentious and elusive border wall with criticism of the White House's foreign policy, specifically Trump's decision to withdraw U.S. troops from Syria where they have been supporting local forces in the fight against the Islamic state militant group, or ISIS.

When Trump made his Syria announcement last week, Graham called the decision a "stain on the honor of the United States," arguing it would be "disastrous to our own national security" and would put Americans around the world and at home "more at risk, not less."

But Thursday's tweet reiterated the senator's support for Trump's wall, and echoed false statements previously made by the president that suggested terrorists were trying to cross the Mexican border into the U.S.

In the run-up to the midterms in November, one of Trump's favored talking points was the migrant caravan traveling from Central America to the U.S. to claim asylum.

Trump suggested "unknown Middle Easterners" had hidden themselves in the thousands-strong caravan, hoping to slip unnoticed into the U.S. He offered no evidence to support his claim—which was parroted by several Republican lawmakers and right-wing media commentators—and later appeared to walk back his claim, saying, "There's no proof of anything."

The majority of terror attacks—Islamist or otherwise—in the U.S. since 9/11 have been perpetrated by U.S. citizens, reported PBS. Most culprits were either born in America or moved to the country at a very young age, despite claims by anti-immigration proponents that new arrivals or undocumented migrants constituted the largest threat.

It is also worth noting that the majority of undocumented migrants do not arrive in the U.S. by crossing land borders but rather by overstaying legitimate visas, according to federal data.

The federal government is currently in a partial shutdown over Trump's insistence on $5 billion in funding for his long-promised wall, a sum Democrats and some Republicans have refused to budge on. Graham has been vocal in his support of the president's decision to allow the shutdown to commence over the dispute, tweeting last week, "It's right to fight for wall funding… Let's dig in!"

Lindsey Graham Capitol press conference
Senator Lindsey Graham during a press conference at the U.S. Capitol on December 20. South Carolina Senator Lindsey Graham claimed that President Donald Trump’s proposed wall along the U.S.-Mexico border was part of America’s defense against terrorism and part of a global strategy against “radical Islam.” Win McNamee/Getty Images