The first witness in Donald Trump’s hush money trial has already established a key component of the case that’s necessary to convict the former president, according to a legal expert. David Pecker, the former publisher of the National Enquirer, told the jury that he sought out damaging stories about his friend ahead of the 2016 election and paid to keep them from publication, and MSNBC legal analyst Lisa Rubin told “Morning Joe” that he had helped prosecutors demonstrate that Trump knew about the scheme and intended for it to help his campaign. “Pecker had a lot of information that we didn’t q…