Special counsel Robert Mueller's investigation into possible collusion between President Trump's 2016 campaign team and the Russia government will close in on 16 months next week, but a new poll shows more than a third of voters believe it's time to wrap it up.

The Aug. 2-6 survey found 46 percent of registered voters nationwide believe it should continue while 37 percent of respondents said it needs to end. The remaining 17 percent said they don't know or had no opinion, according to pollsters behind the Morning Consult-Politico survey.

Those numbers are similar to how voters split over whether they think Trump's team did conspire with Russia to beat Democrat Hillary Clinton in the 2016 election: Forty-two percent of voters said they believe it while 39 percent did not.

Democrats and Republicans are inversely split on the necessity of an ongoing federal investigation continuing, with 76 percent of liberal voters favoring it and the same percent of conservatives against it.

A little less than half of respondents, 48 percent, say a president should be able to share his views publicly about a major investigation as Trump has done. He often rails against Mueller's inquiry as a "witch hunt." Around one-third of voters said such behavior was inappropriate.

Forty-nine percent of voters believe Trump purposely tried to obstruct the investigation. That number has risen 5 percentage points since January. Only 35 percent think his complaints on Twitter and at public campaign rallies were not meant to interfere.

The online poll was conducted among 1,994 registered voters nationwide and had a 2 percentage point margin of error.