The Obama campaign has intensified efforts to attack Romney, who, while short of the 1,144 delegates needed to clinch the GOP nomination, is seen as the presumptive nominee. On Monday, the Obama campaign unveiled a new ad campaign which will seek to paint Romney as a backer of “Big Oil” companies.

Axelrod also addressed President Obama’s comments on Monday, where he said he was “confident” the Supreme Court would uphold the constitutionality of his healthcare reform law.

Axelrod denied the president was trying to “send a message” to the justices.