Former San Antonio Mayor Julián Castro tweeted Tuesday that President Joe Biden should step back from the presidential race to avoid handing a win to Donald Trump. “Joe Biden is a good man and has been a good president,” Castro said on social media platform X. “But last week’s debate disturbingly demonstrated that he is unable to effectively prosecute the case against Donald Trump — much less inspire and mobilize voters to the polls.” Castro continued: “Sadly, President Biden is not the campaigner he was in 2020 — and looks very likely to lose to Trump, one of the weakest candidates in presidential history.