John McCain set for Senate return on Tuesday following cancer diagnosis

It was announced last week McCain has been diagnosed with brain cancer.

McCain has indicated he would vote yes on a motion to proceed vote with the assurance that he can add amendments to the bill once it's on the floor. However, he has also expressed serious concerns about the legislation and isn't a guaranteed yes on a final version of the bill.

"It would help if he's here," Cornyn told us. "Ultimately, we want him back as soon as he can for obvious reasons."

ABC News' Dean Schabner contributed to this report.

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