WASHINGTON — The Senate Banking Committee is once again on track to vote on Iran sanctions legislation after an unexpected delay last week.

The markup, scheduled for Jan. 29, will provide the clearest indication to date of where Congress stands. It comes after a whiplash-inducing week that saw President Obama and European diplomats come out forcefully against any sanctions legislation while House Speaker John Boehner, R-Ohio, invited Israeli Prime Minister Benjamin Netanyahu behind Obama’s back to make the opposite case before Congress.

The bill that has been scheduled for a vote was co-authored by Banking members Mark Kirk, R-Ill., and Robert Menendez, D-N.J., and would escalate sanctions on Iran if no deal is reached by July 6. Democratic support for the bill has been steadily evaporating in the wake of intense lobbying from the White House, while fellow Banking member Bob Corker, R-Tenn., is pushing competing legislation that would instead require Congress to sign off on a final deal.

The markup will be preceded by a Banking hearing on the issue Jan. 27 featuring the State Department’s No. 2, Antony Blinken, and Treasury sanctions chief David Cohen. They will be followed by experts from two pro-Israel think tanks, the Foundation for the Defense of Democracies and the Washington Institute for Near East Policy.