Republican Sen. John McCain says he's considering running for a sixth term in 2016, the year he turns 80.
The former presidents aren't getting behind the presumptive nominee.
Erick Erickson, who has been an outspoken member of the Never Trump movement, questioned the morals of the GOP.
Is Bill's vegan diet helping?
Some donors migrate to Trump as he drops plans to self-finance campaign.
Hillary Clinton is already capitalizing on Donald Trump's controversial role within his party.
President Barack Obama suggested that some Republicans had begun to soften their opposition to increased tax rates on the wealthiest Americans, but sharply warned the GOP against looking to tie their budget fight to an upcoming debt-ceiling debate.