Evalimoshavlo:
It’s a machlokes to when that even refers, including yimei Chizkiyahu, bayis sheini – see Ibn Ezra.
Regardless, it is forbidden for all of, or even a large bloc of, Klal Yisrael to ascend to E”Y before Mashiach. The Zionists tried that (and also rebelled against the nations and took political rule, all of which are forbidden under pain of “Ani mattir es bisarchem…”) and created the cataclysmic disaster there (and also the Holocaust) as a result.
Of course, if there were no need for Jews to be in galus, to gather in the nitzotzos haKedusha wherever they are, then Hashem would just send Mashiach. Therefore, there must be Jews outside of E”Y when Mashiach comes.
But Zionism doesn’t like any of that because it goes against its idolatry and heresy.
Sending emails to Congress is also essentially driven by Zionism, whether they realize it or not, as the Zionist “State” is not what is protecting the Jews there; just the opposite. As the Brisker Rav noted, the Zionists’ unending war are due to Zionism, of course; the Jews who did not survive those wars – that’s also due to the Zionists; the Jews who did survive those wars – that’s due to the lomdei and shmorei Torah and not the Zionists.
The Zionist “State” will be history, probably much sooner rather than later.