Sen. James Lankford (R-Okla.) said on Tuesday that he was confident Senate Republicans could come together to pass a measure repealing and replacing the Affordable Care Act (ACA).

In an appearance on "Fox & Friends," Lankford called for Senate Republicans to hash out their differences on the bill, rather than trying to rally support for the current measure "one at a time."

"I'm still optimistic that we can [pass the bill], and because we must. This is kind of a no-fail moment that you have to be able to resolve all these issues," he said. "My focus for weeks has been, let's get all the people that disagree in one room and let's hammer this all out at one moment."

.@SenatorLankford: I’m still optimistic we can repeal and replace ObamaCare because we must. This is a no fail moment. pic.twitter.com/SZ4L7jH3pv — FOX & friends (@foxandfriends) July 18, 2017

"For whatever reason, we've not been allowed to do that — to get all the different factions into one room at one time," he added. "We've all been negotiating one at a time. If we can get everybody together at one time and finish this, I think we can get it done."

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Sens. Susan Collins Susan Margaret CollinsMcConnell locks down key GOP votes in Supreme Court fight Most Americans think winner of election should pick next Supreme Court justice: poll Murkowski: Supreme Court nominee should not be taken up before election MORE (R-Maine) and Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) announced last week that they would vote against the current Senate healthcare bill.

But two more Republican lawmakers in the chamber — Sens. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (Utah) and Jerry Moran Gerald (Jerry) MoranLobbying world This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans Hillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes MORE (Kan.) — said on Monday that they would not vote for the current plan to overhaul the nation's healthcare system, effectively killing the measure for the time being.

Republicans have remained divided on the best way to replace ObamaCare. Paul, for example, said the current proposal did not go far enough to repeal the existing law and lower insurance premiums.

Collins, on the other hand, has expressed concern over the Senate bill's proposed cuts to Medicaid and has called for Republicans and Democrats to work together to fix the ACA.