“In Washington D.C., 96% of the potential jurors voted against Donald Trump in the 2016 election.”
Convene one in Texas.
A grand jury convened in Texas can only prosecute crimes committed in Texas.
Re: Convene a Grand Jury in Texas.
Since all, or almost all, the crimes took place in Washington D.C., that will never happen.
As for criminal trials, since all, or almost all, the defendants live in the Washington D.C. metro area, it is very unlikely those trials can be moved, unless the defendants agree.