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AP

Google's Sundar Pichai and Facebook's Mark Zuckerberg spoke out against Trump's executive order banning people from seven Muslim-majority countries from entering the U.S.

We're upset about the impact of this order and any proposals that could impose restrictions on Googlers and their families, or that could create barriers to bringing great talent to the US…It's painful to see the personal cost of this executive order on our colleagues. —Sundar Pichai in email to employees

Facebook's Mark Zuckerberg said he's concerned about the impact of the orders and that the U.S. should keep its doors open to refugees.

We need to keep this country safe, but we should do that by focusing on people who actually pose a threat. Expanding the focus of law enforcement beyond people who are real threats would make all Americans less safe by diverting resources, while millions of undocumented folks who don't pose a threat will live in fear of deportation. — Mark Zuckerberg posted on Facebook

Why Silicon Valley cares: Tech companies have real workforce issues to consider. A large number of immigrants work at these companies. Silicon Valley companies rely on temporary visas for high-skilled foreign workers to fill thousands of engineering and technical jobs say they can't fill with domestic talent. Trump has been hostile to any visas that he sees as taking jobs from Americans.

Go deeper

Read: Former Vice President Walter Mondale's last message

Photo courtesy of Mondale.

Former Vice President Walter Mondale wrote a farewell letter to his staff, sent upon his death on Monday, thanking them for years working together.

Dear Team,

Well my time has come. I am eager to rejoin Joan and Eleanor. Before I Go I wanted to let you know how much you mean to me. Never has a public servant had a better group of people working at their side!

Together we have accomplished so much and I know you will keep up the good fight.

Joe in the White House certainly helps.

I always knew it would be okay if I arrived some place and was greeted by one of you!

My best to all of you!

Fritz

Former Vice President Walter Mondale dies at 93

Walter Mondale, left, with former President Jimmy Carter in Jan. 2018 at the McNamara Alumni Center on the University of Minnesota's campus in Minneapolis. Photo: Anthony Souffle/Star Tribune via Getty Images

Walter Mondale, who transformed the role of U.S. vice president while serving under Jimmy Carter and was the Democratic nominee for president in 1984, died Monday at 93, according to a family spokesperson.

The big picture: President Biden, who was mentored by Mondale through the years, said in 2015 that the former vice president gave him a "roadmap" to successfully take on the job.

Scoop: U.S. ambassador refuses Kremlin push to leave Russia

U.S. Ambassador to Russia John Sullivan. Photo: Anton Novoderezhkin/TASS via Getty Images

The United States ambassador to Russia is refusing to leave the country after the Kremlin "advised" him to return home following new Biden administration sanctions, two sources briefed on the situation tell Axios.

Why it matters: John Sullivan, a respected diplomat who President Biden has, so far, retained from the Trump era, is at the center of one of the most important early tests of Biden's resolve.