Talk radio host Howard Stern mocked the idea of President TrumpDonald TrumpTrump State Department appointee arrested in connection with Capitol riot Intelligence community investigating links between lawmakers, Capitol rioters Michelle Obama slams 'partisan actions' to 'curtail access to ballot box' MORE starting a competitor network to Fox News upon leaving office, saying such a venture would collapse within a year.

"[If] he thinks running the country is hard, wait till he has to run a news network," Stern said on his Monday show, according to the New York Daily News. "That’ll fail inside of a year like all the other businesses. This is just insanity what’s going on."

Trump’s businesses have declared bankruptcy on six occasions in relation to overleveraged casino and hotel ventures in New York City and Atlantic City, N.J.

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The president has not addressed speculation about a planned TV network but has repeatedly disparaged Fox News both before and since the election while praising more openly pro-Trump competitors to Fox’s right such as Newsmax and One America News Network.

Chris Ruddy, CEO of Newsmax and a longtime Trump confidant, said recently that he would “never” turn over control of the network to Trump.

Stern, who was a friend of Trump's and frequently had him on as a guest before Trump entered politics, called on the president to concede the election gracefully.

“For once, do something good for the country. Calm down your f---ing loony hillbilly friends and tell them you lost the election and you’re going to help the transition,” Stern said Monday. “These loonies who follow you are all worked up. They think something was taken from them.”

The president has refused to concede to President-elect Joe BidenJoe BidenTrump State Department appointee arrested in connection with Capitol riot FireEye finds evidence Chinese hackers exploited Microsoft email app flaw since January Biden officials to travel to border amid influx of young migrants MORE since he was projected the winner of the election, mounting a series of legal challenges to state results. Trump tweeted that Biden “won” Sunday before backtracking and tweeting, “I concede NOTHING.”