Journey star tells his bandmate to stop performing for Donald Trump
A member of the band Journey has served a bandmate with a cease and desist order after he performed their hit Don't Stop Believin' for Donald Trump.
Guitarist Neal Schon said keyboardist Jonathan Cain "has no right to use Journey for politics".
Cain, whose wife Paula White is an advisor to the former president, played the group's anthem at an event at Mr Trump's estate in Florida last month.
Cain argued that Schon was the one who had been damaging Journey's reputation.
r are already in a legal battle over spending on the band credit card.
Don't Stop Believin' was first released in 1981 but enjoyed a resurgence after being used in TV shows The Sopranos and Glee. 
It was written by Cain and Schon in collaboration with singer Steve Perry, who left the band in 1998. 
Last month, it was revealed to be the most-streamed song from 1981 in the UK.
In his letter, reported by Variety, Schon said his bandmate's performance at the America First Policy Institute's Experience and Gala at Mar-A-Lago was a "harmful use of the brand".
America First Policy Institute is run by former senior Trump White House officials and has been described as an "administration in waiting" should he be re-elected. Paula White-Cain was Mr Trump's spiritual advisor during his presidency and chairs the AFPI's Center for American Values.
Schon's letter said: "Although Mr Cain is free to express his personal beliefs and associations, when he does that on behalf of Journey or for the band, such conduct is extremely deleterious to the Journey brand as it polarizes the band's fans and outreach. Journey is not, and should not be, political."
r continued: "His politics should be his own personal business. He should not be capitalizing on Journey's brand to promote his personal political or religious agenda to the detriment of the band."
Schon later tweeted about the matter, saying: "You just don't go there as you will lose fans."
In a statement, Cain said Schon "should look in the mirror when he accuses me of causing harm to the Journey brand".
He accused his bandmate of taking or threatening legal action against numerous people connected with the band; of sending "bullying, toxic" emails; and of "recklessly" spending Journey's money.
"If anyone is destroying the Journey brand, it is Neal - and Neal alone," Cain concluded.
In November, it was reported that Schon claimed he had been denied access to the group's American Express card and its records, while Cain accused his bandmate of putting more than $1m (£827,000) in "improper personal expenses" on the card.
r current acrimony may make for frosty relations when they go back on tour in January with singer Arnel Pineda, who joined the group in 2007.