If the trade deal passes, it will further limit the ability to block such corporate projects.
The relationship is broadly discussed north of the border, but little known in the US.
The 54-member GOP conference and nine Democrats are expected to vote "yes."
The billionaire climate activist may run for Senate in 2016.
The Democratic senator is sponsoring a bill to approve the pipeline.
Environmentalists are as tough as Obama as industry when it comes to energy policy.
From Keystone to the Capitol Christmas tree, see what you may have missed on Capitol Hill.
Cassidy is crushing Landrieu 58 to 31 among independents in the state.
"It would be the equivalent of calling the American people stupid," the Speaker said.
Forty-six percent say GOP Congress should act first, while 42 percent want Obama to move now.
Obama is expected to act as early as Friday.
The Louisiana Dem is pushing for the oil sands pipeline to boost her December runoff bid.
Even the Democrats most opposed to Keystone gave Clinton cover on the matter.
The Senate fell five votes short of overriding Obama's veto.
Senators are aiming for a final vote on the pipeline Thursday.
President Obama will be using his veto pen a lot. Will voters side with him or the GOP?
It's not yet threatening to veto a GOP bill to authorize construction of the pipeline.
Dems worry Landrieu won't be able to overcome GOP opponent.
Behind the scenes, Landrieu furiously tried to lobby her 60th vote.
The senator said the country would suffer from “dumb disease” if the Keystone XL oil pipeline isn't...
The potential 2016 contender will join labor groups for a briefing on "the Walmart economy"
The Maryland governor is a potential 2016 Dem presidential contender.
The bill was offered by Rep. Cassidy who is challenging Sen. Mary Landrieu.
"I think the ability to get a compromise is more available," he said.