WASHINGTON (Reuters) - Democratic Senator Elizabeth Warren promised to fight a U.S. Senate bill easing bank rules introduced following the 2007-2009 global financial crisis as the chamber moved on Tuesday to begin debating the draft bipartisan legislation.

FILE PHOTO - Senator Elizabeth Warren (D-MA) questions Jerome Powell on his nomination to become chairman of the U.S. Federal Reserve during a hearing before the Senate Banking, Housing and Urban Affairs Committee in Washington, U.S., November 28, 2017. REUTERS/Joshua Roberts

Warren, long a consumer advocate, warned customer protections would be eroded as the Senate moved closer to passing the first rewrite of the 2010 Dodd-Frank financial reform law.

The Senate voted on Tuesday morning 67-32 in favor of debating the bill, paving the way for the chamber to potentially pass the proposed legislation by the end of the week.

Moderate Democrats who support the legislation rejected Warren’s claims, saying on Tuesday it offered critical relief for small and mid-sized lenders and that they expected it to quickly pass the Senate.

Despite her sway among liberal Democrats, Warren’s efforts are unlikely to derail the bill, according to analysts, who on Monday put the chances of it becoming law at around 90 percent.

The bill, authored by Senate Banking Committee Chairman Mike Crapo, has the support of 13 moderate Democrats, which, given broad Republican backing, should be enough to assure passage in the 100-seat chamber.

Several senior Democratic senators, including Warren and Sherrod Brown, have come out against it.

Crapo said Tuesday he was considering making modest, bipartisan additions to the bill, and also said he was in talks with members of the House of Representatives in an effort to include some of their preferred provisions. Lawmakers in the Republican-led House still would need to pass the bill for it to become law.

Speaking to reporters on Tuesday, Senate Democrats who helped write the bill dismissed criticism that it helps large banks, saying it would free up small community banks and credit unions to lend more to small businesses.

“If we’re going to continue to have access to capital in rural areas of our country, this bill needs to pass,” said Senator Jon Tester, adding the increased risk to consumers and the financial system was “very, very, very minimal.”

Republican critics say Dodd-Frank went too far and curbs banks’ ability to lend, while many Democrats say it provides critical protections for consumers and taxpayers.

Republicans have tried for years to revise the law but only recently have some Democrats begun to support tweaks.

Crapo’s bill would ease the capital and operational burden on smaller lenders, but also includes a number of provisions beneficial to all but the largest U.S. banks.

Most notably, the bill would raise the threshold at which banks are considered systemically risky and subject to stricter oversight to $250 billion from $50 billion.

It also exempts banks with less than $10 billion in assets from rules banning proprietary trading.

Tester, however, said Senate Democrats would abandon the bill if House lawmakers add more radical de-regulatory language.

However, a spokeswoman for Representative Jeb Hensarling, who leads banking policy in the House, said Tuesday “the House’s voice will be heard in this debate.”

Senator Heidi Heitkamp, another key backer of the bill, said she expects leaders in the House, as well as the White House, will safeguard the bill so it can make its way to President Donald Trump’s desk for signing into law in coming months.