"We're looking at some enhanced or some additional screening," John Kelly told a hearing of the House Homeland Security Committee.
"We may want to get on their social media, with passwords," he said.
"It's very hard to truly vet these people in these countries, the seven countries... But if they come in, we want to say, what websites do they visit, and give us your passwords. So we can see what they do on the internet," Kelly said on Tuesday.
Kelly told Congress that the measure was one of several being considered to vet refugees and visa applicants from seven Muslim-majority countries, the NBC News reported.
His comments came the same day judges heard arguments over President Donald Trump's executive order temporarily barring entry to most refugees and travelers from Syria, Iraq, Iran, Somalia, Sudan, Libya and Yemen.
Kelly, President Donald Trump appointee, stressed that asking for people's passwords was just one of "the things that we're thinking about" and that none of the suggestions were concrete.
"When someone says, 'I'm from this town and this was my occupation,' [officials] essentially have to take the word of the individual," he said.
"I frankly don't think that's enough, certainly President Trump doesn't think that's enough. So we've got to maybe add some additional layers. As well as asking people for their passwords," Kelly said he was looking at trying to obtain people's financial records.
"We can follow the money, so to speak. How are you living, who's sending you money?" he said.
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