The US Senate overcame bitter divisions on trade policy and passed a legislation that gives President Barack Obama the authority to swiftly conclude a landmark Pacific Rim trade accord.

The measure now heads to the House of Representatives where its fate is uncertain.

But while the passage in Senate late yesterday is a dramatic victory for Obama, the Bill clearly faces a fierce debate in the lower chamber, where lawmakers signalled there is intense opposition from within Obama’s own Democratic Party.

Passage of the so-called Trade Promotion Authority Bill allows the administration to finalise negotiations with 11 other Asian and Pacific nations and bring the trade deal to Congress for an up-or-down vote, with lawmakers not permitted to make changes.

The Bill, which pushes Obama’s top legislative priority in his second term, passed on a 62-37 vote, with all but a handful of Republicans backing their rival in the White House but with most Democrats voting no, in some of their fiercest opposition to Obama in his six-plus years in office.

TPA is “likely the most important Bill we’ll pass this year,” said Senate Finance Committee Chairman Orrin Hatch, who co-wrote the legislation that lays out 150 ambitious US trade priorities, including human rights, environment and labour protections.

Obama offered swift praise for the result of the closely-watched vote.

He stressed that this TPA, previous versions of which were used by several presidents before him to conclude trade deals, includes “strong standards that will advance workers’ rights, protect the environment, promote a free and open Internet, and it supports new robust measures to address unfair currency practices.”

Obama encouraged timely action in the House, but Republican leadership there essentially warned that the passage would be up to Obama’s own party.

“The House will take up this measure, and Republicans will do our part, but ultimately success will require Democrats putting politics aside and doing what’s best for the country,” House Speaker John Boehner said after the Senate vote.

Many Democrats have argued that trade accords often result in sending American jobs to nations with low wages.

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