The Senate is expected to swear in Markey as soon as it meets Tuesday morning at 10 a.m., according to a Senate aide.

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Markey won election to the Senate in a June special election, to fill the seat of Secretary of State John KerryJohn KerryCongress, Trump need a united front to face down Iran One year ago today we declared ISIS atrocities as genocide Trump’s realism toward Iran is stabilizing force for Middle East MORE. Markey defeated GOP candidate Gabriel Gomez 55percent to 44 percent.

Markey's last day in the House will be a breeze, and in fact is already over, at least as far as the floor is concerned. The House adjourned immediately after his letter was read and won't be back until Tuesday morning.