The market just keeps on rising, with the Dow Jones industrial average hitting 21,000 just a few weeks after smashing past 20,000 — but that doesn't mean it's unstoppable, as two experts told CNBC that problems are starting to bubble up.
David Nelson, chief strategist for Belpointe Asset Management, told "Power Lunch" that he's increasingly concerned with rising populism in Europe. Kicked off last summer by Brexit, the populist wave is currently sweeping through France and the Netherlands with candidates like Marine Le Pen and Geert Wilders campaigning to lead the nations. Both have discussed referendums to leave the European Union if elected.
"If you look at Europe, there's a rising populist message," Nelson said. "You know, some of these countries and some of the people want to pull out of the EU."