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... The vote last week to advance a measure to limit Trump's military authority reflects growing uncertainty among Senate Republicans that they know where the president's foreign policy agenda is headed.

"It's the innuendo about, Colombia, you better watch out.' Mexico, you better watch out.' Greenland, we're going to take over you,'" said Sen. Lisa Murkowski (Alaska), one of five Republican senators who voted to send the measure to the floor for a vote.

"Ordinarily, you would just say those are just bluffing words," she said, summarizing Trump's threats to topple other regimes or assume control over other territories. "But when you see he didn't bluff there with Venezuela, it does cause you to just step back and say, What else is being planned?' ...