JOHN YANG: Good evening.

I'm John Yang.

The United States has joined the exodus of foreign diplomats out of Sudan as fighting sends the North African nation deeper into chaos.

U.S. special forces airlifted nearly 100 Americans, most of them U.S. Embassy staffers out of the country by helicopter, taking them to Ethiopia.

But U.S. officials say it's still too dangerous to stage an evacuation of the estimated 16,000 private American citizens trapped in Sudan.

Republican Senator Lindsey Graham was asked about that today on CNN State of the Union.

SEN. LINDSEY GRAHAM (R) South Carolina: Should, yes, I'm worried.

You got thousands of people in the middle of a civil war.

And right now if I were an American in Sudan, I would shelter in place and hopefully we can find a way to end the fighting, get humanitarian aid and get our people out.

JOHN YANG: UN agencies report tens of thousands of Sudanese have already fled the country.

Millions more are left sheltering in their homes as food and water grows increasingly hard to get.

Former Vice President Mike Pence has drawn another direct contrast with his former boss Donald Trump, this time on abortion.

At a gathering of Evangelicals last night in Iowa, Pence said Trump's position that post Roe abortion laws should be left to the states to decide isn't good enough.

Pence said a nationwide ban on abortion after 15 weeks of pregnancy should be considered though he stopped short of endorsing the idea.

MIKE PENCE, Former U.S. Vice President: But I don't agree with the former president who says this is a state's only issue.

We've been given a new beginning for life in this country.

I think we have an opportunity to advance the sanctity of life, move it ever closer to the center of American law.

JOHN YANG: Pence said he hasn't decided yet whether to run for president.

On the Democratic side, President Biden is expected to announce his reelection campaign later this week.

And the once ubiquitous retailer Bed Bath and Beyond filed for bankruptcy today, and said that later this week, it will begin the process of closing its 360 outlets around the country.

The 52-year-old home goods chain has been losing money for years, and a series of recent turnaround efforts have failed.

The company said its 120 Buybuy Baby locations will also begin store closing sales on Wednesday.

Still to come on "PBS News Weekend," how artificial intelligence is being used to create hoax images online.

And the race for valuable resources and shipping routes in the Arctic as melting ice opens up new possibilities.