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 KerryKerry: Trump can’t instantly undo Obama actions ‘All or nothing’ leaves us nothing Kerry: Trump comments on German chancellor ‘inappropriate’ 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.