President Trump claimed Friday that Republican Sens. John McCain and Rand Paul don't like each other personally, arguing during a rally for Sen. Luther Strange in Alabama that it would be "ironic" if Paul replaced McCain as a key vote on an Obamacare repeal measure.

"They gave me a list of 10 people that were absolute no's," Trump said of his efforts to whip support for the healthcare bill, noting Paul, R-Ky., was on the list.

"I haven't given up on him, because I think he may come around," Trump said.

Paul has stood against the latest Obamacare repeal measure, known as the Graham-Cassidy bill, because he claims it does not do enough to dismantle Obamacare.

McCain, R-Ariz., announced his opposition to the bill on Friday, placing the legislation's future in jeopardy ahead of a key deadline in the Senate. Republicans will lose their ability to pass the plan with a simple majority at the end of September, after which they will need at least 60 votes to repeal Obamacare because legislation will be subject to Democratic filibusters.

"Wouldn't that be ironic, if he took John McCain's place — and they definitely do not like each other — wouldn't that be ironic?" Trump asked.

Strange faces a run-off for the Republican Senate nomination on Tuesday in the special election to fill the remainder of Attorney General Jeff Sessions' Senate term.