For the first time in recent months, registered voters in the U.S. say that the top issue on their minds is the threat facing democracy, according to a poll from NBC released Sunday. Previous NBC polls in March and May showed that the top issue on the minds of those surveyed was cost of living.

The poll this time found that 21 percent of voters ranked "threats to democracy" as the most critical matter facing the country, while 16 percent chose "cost of living," which ranked as second. In third was "jobs and the economy," with 14 percent.

The poll also asked voters about their opinion on the investigations into former President Donald Trump's alleged misconduct: 57 percent of voters polled believe they should continue, while 40 percent said they should stop.

Earlier this month, the FBI, with the approval of Attorney General Merrick Garland, carried out a search of Trump's Mar-a-Lago property in Florida as part of an investigation into whether the ex-president mishandled classified documents. Many Republicans have criticized federal law enforcement officials in the wake of the raid, with Trump describing it as part of an ongoing "witch hunt" against him.