IOW the White House needs a defensive force to repel an attack.
These guys might be called in proactively to be stationed wherever the president determines he needs to make a stand to repulse a rogue effort to unseat him, in particular, prior to official certification of a harris-biden victory (if it comes to that).
ok, if so, one question that could be raised is why not retreat to a more easily presumably defensible location such as andrews afb or camp david?
one supposes that the answer would be that the white house has a very high symbolic value to the US public. if trump leaves the white house for any reason, then the white house becomes an expendable target in terms of keeping formal control of the presidency. if there were a shortage of troops to repel an insurrection aimed at camp david and the white house, then it would force an operating decision made to abandon the white house in favor of camp david, at which time harris-biden insurgents could in theory overcome white house guards, occupy the white house, and claim the presidency by right of physical occupancy of the white house.
going a step further in this hypothetical scenario, it would not imho be totally inconceivable that a military insurgency would use a civilian (eg antifa) force as an offensive shield. this would be a significant PR victory for insurgents even if the invasion were repelled, due to a non-zero civilian casualty list and videos that could be replayed on the MSM without limit for days, weeks, or months (as needed as determined by the deep state, again in this hypothetical scenario).
Marines can hold a beach head like nobody’s business. It’s part of what they do before breakfast.
About 2-5 minutes up river. Save SpecOps for taking out high level multinational targets who are popping corks on 1,000 Euro Champagne since 4 am on Nov 4th thinking they pulled it off.
The White House has a lot of Secret Service (agents and uniformed officers). They are more of them than people think, and they are very well armed.