(CNN) - Kentucky Sen. Jim Bunning again took aim at his party Tuesday, blaming fellow Senate Republicans, in part, for his poor fundraising performance so far this year.
According to the Louisville Courier-Journal, Bunning lashed out at Senate Minority Leader Mitch McConnell - Kentucky's other senator - for launching fundraising efforts for his own campaign even though he will not face re-election for another five years.
"My senior senator [McConnell] also sent out his first mailing for 2014. Just as I refrained from doing it for two years, he sent out his, so you know where he stands," Bunning said in a conference call with local reporters, according to the paper.
Earlier this year, Bunning threatened to sue the National Republican Senatorial Committee if it backed an alternative GOP candidate. On Tuesday, he said NRSC chairman John Cornyn and the nation's poor economy were to blame for his underwhelming fundraising haul so far.
Bunning - who has roughly $150,000 in his campaign account, according to his most recent FEC filing - is considered one of the Senate's most vulnerable Republicans heading into the next cycle.
The outspoken senator also drew headlines last month with his prediction that Supreme Court Justice Ruth Bader Ginsburg, who suffers from cancer, would be dead within the year. He later apologized for that comment.