President Trump touted U.S. border security Friday in the wake of a terror attack in Spain that left at least 14 people dead.

Homeland Security and law enforcement are on alert & closely watching for any sign of trouble. Our borders are far tougher than ever before! — Donald J. Trump (@realDonaldTrump) August 18, 2017

The tweet comes a day after a van was driven into a crowded tourist area in Barcelona's city center.

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The Islamic State in Iraq and Syria claimed responsibility for the attack through its propaganda arm on Twitter.

U.S. officials and Trump were quick to condemn the attack on Thursday.

The United States condemns the terror attack in Barcelona, Spain, and will do whatever is necessary to help. Be tough & strong, we love you! — Donald J. Trump (@realDonaldTrump) August 17, 2017

Trump has made security a signature issue of his presidency, though he's come under fire for his response to the violence at a white supremacist rally in Charlottesville, Va., that Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE has described as domestic terrorism.