WASHINGTON — Republicans are ready to muscle legislation through the House authorizing an election-year lawsuit against President Barack Obama that accuses him of exceeding his powers in enforcing his health care law.

A party-line vote — and plenty of partisan rhetoric — was expected when the GOP-led chamber considers the measure today.

Democrats dismiss the proposal as a legally groundless exercise that could end up costing taxpayers millions of dollars in legal fees and expenses.

They’ve branded the effort a political charade aimed at stirring up Republican voters for the fall congressional elections. They say it’s also an effort by top Republicans to mollify conservatives who want Obama to be impeached — something House Speaker John Boehner, R-Ohio, said he has no plans to do.

“This lawsuit is frivolous on steroids,” Rep. Alcee Hastings, D-Fla., said as the House Rules Committee met to clear the way for today’s debate. “It’s absolutely insane what you all are doing.”