Upton, the senior Republican in Michigan's House delegation, says the revelation "only confirms" his decision not to endorse Trump.
Michigan Republicans Calley, Upton call on Trump to drop out →
Rep. Fred Upton, the Michigan Republican overseeing the talks on opioids, said the deal should be ready for a floor vote on Friday.
Opioid funding bill in doubt as GOP refuses immediate $1 billion →
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