Congress can get ready to remove Trump, initially for being crazy (6,1,5,5)

I think it could be either:

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6,1,5,5

having a screw loose

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'ready to remove trump initially for being crazy' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'congress can' is the wordplay.
I cannot really understand how this works, but
'congress' could be 'screw' (screw is a kind of congress) and 'screw' is located in the answer.
'can' could be 'loo' (loo is a kind of can) and 'loo' is found in the answer.
This may be the basis of clue (or it may be nonsense).

'get' acts as a link.

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I've seen this clue in The Guardian.

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