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

Sen. Marco RubioMarco Antonio RubioInviting Kim Jong Un to Washington Venezuela closes border with Brazil The Hill's 12:30 Report: Trump escalates fight with NY Times MORE (R-Fla.) said Sunday that it's in President TrumpDonald John TrumpSchiff urges GOP colleagues to share private concerns about Trump publicly US-China trade talks draw criticism for lack of women in pictures Overnight Defense: Trump to leave 200 troops in Syria | Trump, Kim plan one-on-one meeting | Pentagon asks DHS to justify moving funds for border wall 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 SessionsEx-Trump aide: Can’t imagine Mueller not giving House a ‘roadmap’ to impeachment Rosenstein: My time at DOJ is 'coming to an end' Five takeaways from McCabe’s allegations against Trump 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.