Rubio: 'Best thing' for Trump and country is to allow Mueller investigation to finish

Sen. Marco RubioMarco Antonio RubioOvernight Defense: Trump faces blowback over report he discussed leaving NATO | Pentagon extends mission on border | Senate advances measure bucking Trump on Russia sanctions Senate advances measure bucking Trump on Russia sanctions Rubio slams NY Times for 'absurd criticism' of Bolton over Iran MORE (R-Fla.) said Sunday that it's in President TrumpDonald John TrumpVeterans groups demand end to shutdown: 'Get your act together' Brown launches tour in four early nominating states amid 2020 consideration Pence on border wall: Trump won't be ‘deterred’ by Dem ‘obstruction’ MORE's best interest to let special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE complete his investigation into Russian interference in the 2016 election.

Rubio, appearing on "Fox News Sunday," echoed a number of his Republican colleagues in defending the special counsel in the face of Trump's call last week for Attorney General Jeff SessionsJefferson (Jeff) Beauregard Sessions5 takeaways from Barr’s testimony AG pick Barr emphasizes independence from Trump Hillicon Valley: Trump AG pick signals new scrutiny on tech giants | Wireless providers in new privacy storm | SEC brings charges in agency hack | Facebook to invest 0M in local news MORE to end the Mueller investigation.

Rubio said the "best thing that can happen" for Trump and the country is for the investigation to "run the course and for all the truth to come out."

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He added that he believes any strong evidence that the president's campaign directly colluded with Russia would have leaked by now.

Asked if he believes Trump should sit for an interview with the special counsel, Rubio said he wouldn't "pre-judge" if the president declined an interview.

"There are plenty of people who are innocent whose lawyers would tell them not do sit down and answer questions from a prosecutor because there's all sorts of other problems involved in that," Rubio said.

Trump has said he'd like to speak with Mueller, but his attorneys have cautioned against it. The two sides are in negotiations about a potential interview, with Mueller reportedly offering to limit his questioning.

As part of a recent escalation of attacks on the Mueller investigation, Trump tweeted last Wednesday that Sessions "should stop this Rigged Witch Hunt right now, before it continues to stain our country any further."

The tweet drew pushback from a number of Republicans, and a significant bloc of Democrats. However, some Republicans, including Vice President Pence, have called on Mueller to conclude his investigation promptly.

The New York Times reported that Mueller is reportedly looking at Trump's use of Twitter as part of an investigation into whether the president obstructed justice.