President Donald Trump says the United States must be “proactive” and “nasty” against the Islamic State group.

On Twitter Friday Trump says: “We have made more progress in the last nine months against ISIS than the Obama Administration has made in 8 years.” He adds: “Must be proactive & nasty!”

Trump was tweeting after a homemade bomb exploded on a packed London subway train during rush hour on Friday. The incident left 18 people injured but no one seriously hurt. Police said the explosion was a terrorist attack, the fifth in Britain this year.

Earlier used the incident to defend his travel ban against six Muslim-majority countries. As a candidate, Trump often pledged to “bomb the hell out of ISIS” and vowed to enact a Muslim ban.

President Donald Trump is defending his travel ban. He says it should be “tougher and more specific.”

On Twitter Friday Trump says: “The travel ban into the United States should be far larger, tougher and more specific-but stupidly, that would not be politically correct!”

Trump made the comment after tweeting about a reported explosion and fire on a subway train in London that police say was a terrorist incident.

The ban affects travelers from six mostly Muslim nations and refugees anywhere in the world.

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Photo Credit: In this aerial image made from video, police officers work at the Parsons Green Underground Station after an explosion in London Friday, Sept. 15, 2017. A reported explosion at a train station sent commuters stampeding in panic, injuring several people at the height of London's morning rush hour, and police said they were investigating it as a terrorist attack. Pool via Associated Press