This has been the Summer of Trump on the campaign trail. Donald Trump has flown high in the polls, with seemingly nothing emerging to slow his rise.

But as heading into September, here are three hurdles the reigning Republican front-runner might have to contend with that run counter to his success so far:

Despite a Supreme Court ruling that compelled a Rowan County clerk in Kentucky to give out marriage licenses to gay couples, Kim Davis refused to comply once again on Tuesday morning by denying marriage licenses to everyone.

Ryland Barton, a reporter for Kentucky Public Radio, reports that Davis said she made the decision "under God's authority."

Saying that he wants to emphasize mercy, Pope Francis announced that during the church's upcoming holy year, he will allow all priests to forgive women who have had abortions.

In a letter published Tuesday, Francis said he understands that some people approach abortions with "superficial awareness." But for others, it's a struggle that deserves deep reflection. The pontiff concludes:

A flood of migrants, including refugees from Syria and Afghanistan, are now stranded in Budapest after the Hungarian government closed down the city's main train terminal.

Authorities had been allowing migrants to travel to Western Europe without checking passports, but on Tuesday, the station was closed and migrants began protesting.

President Obama has slow-jammed the news on late-night TV and sat down with wacky YouTube celebrities — but the show he's joining this week might just make those appearances look buttoned up and boring.

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