Republican presidential candidate Mitt Romney says Paul Ryan has the experience needed to become president.

Romney says he considered a number of people to be his running mate, but readiness to be president was the first and most important factor he considered.

He tells CBS' "60 Minutes" that Ryan has the judgment, character and capacity to become president if necessary.

Romney announced Saturday that he had picked the 42-year-old Wisconsin congressman to be his vice presidential candidate. Ryan has served in Congress for 14 years.