The leader of the Democratic National Committee (DNC) must be able to do the job full-time, Howard Dean said Monday, casting doubt on the viability of Rep. Keith Ellison (D-Minn.), who is reportedly interested in the position.

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Dean, who is running to be DNC chairman, said he respects Ellison, but it is difficult to be both a congressman and chairman of the party.

"I think Keith is terrific. I went door to door with him on his first campaign. I like him a lot. You cannot do this job if it's not full-time. Period. Full stop. End of story," Dean said on MSNBC's "Morning Joe." 

Dean, who served as the DNC chairman from 2005 to 2009, said he will still support the winner. 

Democrats in Washington appear to be lining up behind Ellison, the first Muslim elected to Congress. 

Sen. Bernie SandersBernie SandersSenators introduce bipartisan infrastructure bill in rare Sunday session Bipartisan infrastructure win shows Democrats must continue working across the aisle 'The land is us' — Tribal activist turns from Keystone XL to Line 3 MORE (I-Vt.) and retiring Senate Minority Leader Harry ReidHarry Mason ReidWhite House seeks to shield Biden from GOP attacks on crime issue Lobbying world Warner backing 'small carve-out' on filibuster for voting rights MORE (D-Nev.) have both endorsed Ellison to be the next DNC chairman.

“My friend Keith Ellison is a terrific leader and a strong progressive who knows how to get things done,” Reid said.

“Now is the time for new thinking and a fresh start at the DNC. Now is the time for Keith.”