A Burmese American woman was eager to bring her siblings over to the U.S. from Myanmar amid a more than 15-year wait for visas.

Trump has justified the bans by citing security risks, including a recent incident in Colorado involving an Egyptian national, although Egypt is not on the banned list.

Here is a closer look at why the administration says it is instituting full bans on foreign nationals traveling to the U.S. from 12 nations.