Former Trump White House staffer Sarah Matthews is worried that Donald Trump could become president again. While speaking to MSNBC’s Jen Psaki, Matthews, who testified before the House panel investigating the January 6, 2021, insurrection, said the businessman has “gotten more unhinged in his rhetoric.” “Obviously, Donald Trump’s first four years in office were marked by lots of controversies but I think that the type of rhetoric that he is using today, it’s really concerning,” Matthews, who resigned as Trump’s deputy press secretary on the day of the 2021 U.S. Capitol riot, said. “It’s almost…