That's the ultimate aim. State control over the economy is within the textbook definition of socialism. And one of the easiest way to achieve it is through state control over financial sector. It could, actually, be done and bank nationalisations aren't unheard of, even in today's capitalist world, although they usually occur on small scale and on case-by-case basis.

Whether Ms. Tlaib and her supportres have enough political support for such drastic measure is another question. My educated guess is "no" at this point, but it can change if so-called Overton Widnow moves further left in economic issues, probably in the next election cycle or two.