In a significant move to enhance national security, President Trump has signed a proclamation imposing a travel ban affecting a dozen countries, with additional restrictions on seven others. This decision follows discussions within the White House regarding new measures after a recent attack in Boulder. The ban is set to take effect on Monday and aims to restrict entry for foreign nationals from the specified nations, reflecting ongoing concerns about potential security threats. Various sources, including CBS News, have reported on these developments as the administration seeks to bolster public safety.