President Donald Trump’s new ban on travel to the U.S. by citizens from 12 mainly African and Middle Eastern countries took effect Monday amid rising tension over the president’s escalating campaign of immigration enforcement.

Meanwhile, scores of scientists at the National Institutes of Health sent their Trump-appointed leader a letter titled the Bethesda Declaration, a frontal challenge to policies they say undermine the NIH mission, waste public resources and harm people's health.

Here's the latest:

Some visa holders in Venezuela changed travel plans to arrive in US ahead of deadline and minimize airport issues

But others who lack visas on Monday said the new restrictions may not make much of a difference because obtaining the required permits to travel to the U.S. was alrea

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