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Judge Andrew Napolitano said Special Counsel Robert Mueller's investigation may still go on for a while, despite calls from Vice President Mike Pence and others for him to wrap it up. 

White House Chief of Staff John Kelly joined the chorus in recent days, questioning whether Mueller's probe has actually uncovered anything on President Trump after a full year. 

"Something that has gone on this long without any real meat on the bone, it suggests to me that there is nothing there, relative to our president," he told NPR

Napolitano said on "America's Newsroom" that Mueller does not have a "duty to tip his hand or show his cards" or speed up the probe to a conclusion.

"I understand their impatience, but it will come to an end one of these days," he concluded. 

The Fox News senior judicial analyst said if Mueller finds potential crimes unconnected to Trump, he can pursue them himself - as he did with Paul Manafort - or hand the evidence to federal prosecutors, as he did with the Michael Cohen investigation in New York. 

"I don't think he had any idea what he was gonna stumble on," said Napolitano. 

He emphasized that the guilty plea by former Trump campaign official Rick Gates likely provided Mueller's team with a "treasure trove" of new evidence, which is taking a long time to investigate. 

Watch the analysis above. 

VP Pence: Time to 'Wrap Up' Mueller Probe in the Interest of the Country

Judge Nap: Rick Gates Is Likely Providing a 'Treasure Trove' of Info to Mueller

Former Prosecutor: DOJ Must Require Mueller to Show Evidence of 'Serious Crime'