Senate Republican leader Mitch McConnell (R-KY) is worried his own party will repeat mistakes from the 1930s — and warned about it in an opinion piece Thursday in The New York Times. McConnell — who endorsed former President Donald Trump’s 2024 campaign in March — kicked off his piece lamenting that Europe and the United States met a “militant authoritarian with appeasement or naïve neglect” in the ’30s, and said today America and its allies face “some of the gravest threats to our security since Axis forces marched across Europe and the Pacific.” While he made no mention that Trump’s own rhet…