The US plans to expand the number of countries covered by its travel ban to more than 30, US Homeland Security Secretary Kristi Noem said on Thursday.

Noem, in an interview on Fox News' "The Ingraham Angle," was asked to confirm whether the administration of President Donald Trump would be increasing the number of countries on the travel ban list to 32.

Trump signed a proclamation in June banning the citizens of 12 countries from entering the United States and restricting those from seven others, saying it was needed to protect against "foreign terrorists" and other security threats. The bans apply to both immigrants and non-immigrants, such as tourists, students and business travelers.