I assume “them members of Congress” was a typo not a fall back to Clem Caddidlehopper grammar, but the rest of it is just as ignorant — and dishonest. They did not tell the military to “defy the president” they reminded them that they are not allowed to follow illegal orders.
And the idea that what they said is “by definition illegal” is fatuous in the extreme. He went to Yale Law. They need to ask for the diploma back.
The more these people hang around with Trump the dumber they sound.