Senate Majority Leader Harry ReidHarry ReidConservative Senate candidate calls on GOP to end filibuster Ex-Reid aide: McConnell's 'original sin' was casting ObamaCare as 'partisan, socialist takeover' GOP faces growing demographic nightmare in West MORE (D-Nev.) said Tuesday that he is "optimistic" the Senate would reject five Republican amendments that would limit or even phase out the Export-Import Bank, and said he is "hopeful" the Senate will approve the unaltered House-passed bill later in the day.

"I'm optimistic, optimistic, that my Republican colleagues will make the right choice and help us defeat these vexatious amendments," Reid said on the Senate floor. "I'm hopeful that the Senate will pass it overwhelmingly, signaling to American businesses that we'll do what it takes to help them compete in a global market," he added of the bill itself.

Reid was much more optimistic Tuesday than he was on Monday, when he warned that partisan fighting might stall the Ex-Im reauthorization bill. That reflects an agreement reached Monday to allow votes on the GOP amendments, after which the Senate should vote on final passage.

Under the agreement, 60 votes will be needed to pass the GOP's limiting amendments, making them unlikely to pass in early afternoon votes, given Democratic opposition. Final passage of the bill, H.R. 2072, will also require 60 votes, but that goal is much more achievable, given that many Republicans support the Bank.

Most Republican amendments would limit the Ex-Im Bank's ability to offer export financing that helps U.S. companies sell overseas, but one, from Sen. Mike LeeMike LeeTrump's DOJ gears up for crackdown on marijuana Cruz offers bill to weaken labor board's power Overnight Finance: GOP offers measure to repeal arbitration rule | Feds fine Exxon M for Russian sanctions violations | Senate panel sticks with 2017 funding levels for budget | Trump tax nominee advances | Trump unveils first reg agenda MORE (R-Utah), would phase out the Bank completely after a year. Republicans are split on the bill, as Lee and others would prefer a global negotiation to end all export assistance to companies.

Reid said he received a letter from the U.S. Chamber of Commerce on Monday that supports passage of the bill, H.R. 2072, and warned that the Chamber would be closely watching to see which senators support Ex-Im, and which support amendments to weaken the Bank.

"The Chamber of Commerce will consider votes on this measure and any amendments that would weaken the bank ... keys to knowing whether senators are business-friendly. These kinds of amendments are unacceptable to the business community," Reid said of the GOP amendments.

Reid also read from the Chamber's letter, which said failing to reauthorize the Bank would put jobs at risk in thousands of U.S. companies that depend on Ex-Im to export to global markets.