For more than a year, Trump and Khan have publicly debated Trump's calls for a ban that would block Muslims or people from several predominantly Muslim countries from entering the United States. Khan, a human rights lawyer and practicing Muslim whose parents are from Pakistan, has repeatedly accused the president of having an "ignorant view of Islam." Soon after the Saturday night attack on London Bridge, Trump tweeted about the attack and used it to promote his travel ban, which is being blocked by the courts. Trump also accused Khan of not taking the threat of terrorism seriously enough, citing a quote from Khan that had been taken out of context.