Biden calls Ryan to offer congratulations, welcome him to race

Vice President Biden called Rep. Paul RyanPaul RyanRyan: Graham-Cassidy 'best, last chance' to repeal ObamaCare Ryan: Americans want to see Trump talking with Dem leaders 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-Wis.) on Saturday to congratulate him on being selected as Mitt Romney's running mate and to "welcome him to the race," according to a statement from the Obama campaign.

Biden "urged Congressman Ryan to enjoy the day with his family, and said he looked forward to engaging him on the clear choice voters face this November," the statement said.

The vice president, who is spending the weekend in Delaware after taking a week of down time, is scheduled to return to the campaign trail Monday.

Biden is expected to visit North Carolina and Virginia.

Biden has had warm words for the seven-term GOP lawmaker before.  In a speech in June, Biden called Ryan a “a bright, handsome guy from the state of Wisconsin. He's a fine guy.” But Biden was quick to add, “I I think his ideas are not nearly as fine as he is a man.”

Biden has been a tough critic of Ryan’s budget plan, which would cut $5 trillion in spending and turn Medicare into a subsidized private-insurance model. Democrats hope to make it a central issue in the election.