Former House Speaker Newt Gingrich (R-Ga.) was first out of the gate Tuesday to oppose a fallback plan by the Senate's top Republican to prevent a default on U.S. debt.

Amid conservative uproar over a plan by Senate Minority Leader Mitch McConnell (R-Ky.) to defuse an impasse on the debt ceiling, Gingrich was the first GOP presidential candidate to come out in opposition to the new plan.

He said in two tweets:

McConnell's plan is an irresponsible surrender to big government, big deficits and continued overspending. I oppose it.

The answer to Obama's irresponsibility is a principled "no", not a blank check.

Conservatives have already largely decried the plan, which would authorize increases to the debt limit in three installments, subject to Congressional oversight, and as long as it was accompanied by a plan to cut spending.