In a blog post on ATR’s website, the group states that a vote for Plan B, which could come up as early as Thursday, will not be a violation of the pledge.

“This legislation — popularly known as “Plan B”— permanently prevents a tax increase on families making less than $1 million per year. Republicans supporting this bill are this week affirming to their constituents in writing that this bill — the sole purpose of which is to prevent tax increases — is consistent with the pledge they made to them. In ATR’s analysis, it is extremely difficult — if not impossible—to fault these Republicans’ assertion.”