By Maria Ward-Brennan In an highly anticipated news conference following the Nato Summit in Washington DC, President Joe Biden had a few slip ups, as he battles calls from within his own party to step down. Biden used the press conference to try and bat away questions of the concerns from supporters and donors of the Democratic Party, but fell at the first hurdle. When asked about losing support and Vice President Kamala Harris, he answered by mixing up her name withDonald Trump’s name, saying: “I wouldn’t have picked vice president Mr Trump to be Vice President if she wasn’t qualified.” On th…