People could be asked to hand over their social media passwords when entering the US, as part of enhanced security checks currently being consider by Homeland Security secretary John Kelly.

According to NBC News, Kelly told Congress that it was one of several measures being considered to vet refugees and visa applicants from the seven countries under the immigration ban.

“We want to get on their social media, with passwords: What do you do, what do you say?” Kelly is reported as saying to the House Homeland Security committee. “If they dont want to cooperate then you dont come in.”

Kelly’s consideration comes as President Donald Trump’s ban on people from Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen continues to fought from all sides. He argued that officials “don’t have a lot to work with” in the current vetting process and obtaining people’s passwords would provide the US with a better idea of who people are.

Kelly went on to say that he was also looking at trying to obtain people’s financial records from the named countries. He did, however, make it clear that these were just suggestions at present.

There is precedent for the consideration of obtaining passwords by the Department of Homeland Security. Under the Obama administration in 2015, a similar idea was proposed but never adopted.