Houston, June 10 -- An extensive travel ban issued by U.S. President Donald Trump took effect on Monday amid growing chaos over the Trump administration's immigration enforcement.

Over the weekend, protesters clashed and faced off with National Guard troops in downtown Los Angeles during the demonstrations against immigration raids that swept across California.

In New York City, demonstrators occupied the Trump Tower on Monday, demanding the release of immigrants detained in recent raids. Police arrested at least 20 of them after a standoff lasting about 20 minutes, local media reported.

Trump signed a proclamation last week, fully banning the entry of nationals from 12 countries, namely Afghanistan, Chad, the Republic of the Congo, Eq...