The two spoke for an hour. A press release from the office of the Mexican president said they had "agreed at this point not to speak publicly" about payment for President Trump's planned border wall.
Mike Pence is the first vice president to address the decades-old annual rally that abortion-rights opponents call the March for Life. The event is drawing comparisons to last week's Women's March.
Prime Minister Theresa May said at a news conference that she was convinced a trade deal was in the national interest of both countries. She also said Trump confirmed he is "100 percent behind NATO."
A Trump official says he expects peer-reviewed research will be subject to vetting during the transition period. If such a rule became permanent, it would be a radical departure from existing policy.
President Trump indicated that potential deals between the pipeline companies and the federal government would be renegotiated, with the goal of allowing construction to move forward.
Trump repeated the unproven claim to congressional leaders on Monday, and his press secretary on Tuesday affirmed "the president does believe that." There is still no proof of widespread fraud.
Claims about the size of crowds for both President Trump's inauguration and the protests that followed the day after, are being debated. Scientists struggle with how to do that kind of head count.