Would California benefit from becoming a right-to-work state?

The California Association of Psychiatric Technicians is raising money to fight Donald Trump.
The union that represents 6,200 state mental health workers has decided to charge members $6.50 per month to pay for extra political activities. The new political action fee will be collected from January 1, 2018, until December 31, 2020.
Why? Union leaders are worried that the Trump administration will advance right-to-work legislation that would give workers the right to stop paying dues to the unions