People need to remember that in May 2018 Trump rolled back the market protections Obama put in place after the last recession. Four months later the stock market started to dive, with the banking industry be one of those hit hardest.
Trump signs law rolling back post-financial crisis banking rules
On top of that we have Trump attacking the fed on Twitter. This is making the market feel less stable.
We have the treasury secretary tweeting about calling banks about their level of liquidity. This is making the market feel less stable.