In the NELK Boys interview, Trump was asked about what songs he picks at Mar-a-Lago parties:

"You know what gets 'em rocking? YMCA. YMCA gets people up and it gets them moving."

When asked what was the best song to follow YMCA with, he said:

"Maybe...'Hold on I'm Coming'"

Source: https://rumble.com/vx3mg9-nelk-boys-video-interview-with-president-donald-trump.html starting at the 46 minute mark.

Here are the lyrics to "Hold On I'm Coming" by Sam & Dave:

Don't you ever feel sad, Lean on me when times are bad. When the day comes and you're down, In a river of trouble and about to drown

Just hold on, I'm comin', Hold on, I'm comin'.

I'm goin' my way, your lover. If you get cold I'll be your cover. Don't have to worry `cause I'm here, No need to suffer baby, I'm here.

'Cause hold on, I'm comin' Hold on, I'm comin'

Reach out to me for satisfaction, Call my name now for quick reaction.

Source: https://www.songfacts.com/lyrics/sam-dave/hold-on-im-comin

Interesting, now what about YMCA? Why MCA? What is MCA? First search result:

"Military Commissions Act of 2006"

The Military Commissions Act of 2006, also known as HR-6166, was an Act of Congress signed by President George W. Bush on October 17, 2006. The Act's stated purpose was "to authorize trial by military commission for violations of the law of war, and for other purposes".

Source: https://en.wikipedia.org/wiki/Military_Commissions_Act_of_2006

Trial by military commission, Law of War.

Signed October 17. Q started posting October '17.

Stretch? There are no coincidences.