The "cash for clunkers" program is an example of the Obama administration's mismanagement of the economy, Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSenate passes 0B defense bill Overnight Health Care: New GOP ObamaCare repeal bill gains momentum Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea MORE (R-Ky.) asserted Monday.

McConnell, an original opponent of the auto rebate program, took to the Senate floor this afternoon to criticize the plan ahead of a vote expected this week in his chamber to offer a $2 billion extension to the initiative.

"Last week we saw the administration's tendency to miss the mark on economic estimates again with the so-called 'cash for clunkers' program," McConnell said in prepared remarks. "We were told this program would last for several months. As it turned out, it ran out of money in a week, prompting the House to rush a $2 billion dollar extension before anybody even had time to figure out what happened with the first billion."

While the extended funding for the program passed the House fairly easily, some senators in both parties have expressed a reluctance to quickly sign off on a bill expected to hit the floor this week.

Transportation Secretary Ray LaHood warned Sunday that the program would have to be suspended next week if the Senate fails to approve more funding this week.

"Americans are telling us that health care is too important to rush," McConnell said. "They're saying it's too important to base our decisions on this issue solely on the estimates that we're getting from the same people who brought us the stimulus and cash for clunkers."