Democrats will charge into January with a sweeping mandate — but as President Trump has repeatedly noted, his veto power can deliver a robust roadblock to his opponents' agenda.

Why it matters: Democrats may be forced to compromise to get legislative priorities through. Trump will have to decide how frequently he'll use the power — and whether he'll strike down bills popular among Americans.

State of play: Democrats have secured 54 seats in the upcoming Senate, per the AP's projections , and are leading in two tight races in Mississippi and Alaska that have yet to be called.

In the House, they've won 254, per AP , with several race calls still to come.

Neither majority will be large enough to cross the two-thirds threshold Democrats would need to override a presidential veto on their own.

Friction point: Trump knows that — and has teased his plans to impede Democrats' progress by using the power liberally.

On Tuesday night, as election results rolled in, Trump posted an image of a red MAGA-esque hat…