Fun fact: He also couldn't stand Donald Trump. According to Eliot Weisman's book, The Way It Was, Trump and Sinatra have a long history, dating back to when Trump believed Sinatra's fee to perform at his casino was too high. So, what did Frank do? He allegedly told Trump to "Go fuck himself" and ended up playing at another casino instead.
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He's hated him ever since.
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So, in case you're new here, Frank's daughter, Nancy, has quite a history defending her father from Trump supporters.
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In May, she responded to someone who said her father would vote for Trump:
And now, she’s elaborating on it, replying to someone who said her dad was a "great Republican:" "Frank was a registered Democrat all of his life. He did vote for a couple of Republicans over the decades: Nixon because of his stance on China and Reagan because they were very close friends."
As @tonyposnanski said, "My favorite part of Twitter is when people have to decide who knows more about Frank Sinatra...his daughter or FREEDOMTRUTH8927382682371?"