Michele Kelemen

Russia's ambassador to the United States, Sergey Kislyak, is not known to seek the limelight. He's a mild-mannered diplomat and an arms control expert who came to Washington as ambassador in 2008. But he has been in the news a lot of late, as Trump administration contacts with him come under scrutiny.

One of the very first bills President Trump signed into law this month killed a Securities and Exchange Commission rule meant to promote transparency in countries riddled with corruption. Trump said getting rid of the rule, which required oil, gas and mining companies to disclose overseas royalties and other payments, would bring back jobs and save extraction companies many hours of paperwork and, potentially, hundreds of millions of dollars.

Rex Tillerson is heading on his second foreign trip as secretary of state later this week. But as in his visit last week to Germany, Tillerson is expected to try to keep a low profile when he travels to Mexico on Wednesday.

Tillerson has said very little in public since taking office. There has been no State Department briefing since the Trump administration began a month ago.

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KELLY MCEVERS, HOST:

This is a new era for U.S. relations with the European Union.

Gone are the days when the U.S. was more supportive of European integration than some Europeans are. The European Union's top diplomat, Federica Mogherini, is expecting a more businesslike, "transactional" approach with President Donald Trump, who has been skeptical of the EU and backs the British exit plan.

"We do not interfere in U.S. politics ... and Europeans expect that America does not interfere in European politics," Mogherini told reporters at the end of her trip to Washington.

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