US Homeland Security Secretary Kristi Noem urged Poles to vote for the nationalist opposition candidate in Sunday’s presidential election, wading into a tightly-contested campaign that threatens to derail efforts to rebuild the country’s democratic institutions.

The Conservative Political Action Conference, a U.S. group that seeks to spread conservative ideas worldwide, is holding its first meeting in Poland, where the second round of a presidential election will be held on Sunday.

Eurosceptic Nawrocki's win can deliver considerable setbacks to former European Council President Tusk's pro-EU government.