the Chazon Ish said tachanun He also was exceedingly adamant that every eligible voter must vote at Israeli Elections, unlike some other influence-rs.
I will resume Tachanun after Yom ha’Atzmaut, and re-suspend Tachanun come Yom Yerusholayim. But just for the record:- Both Tachanun & Hallel come from the very same book of Tehillim, 1 being Chapter 6, and the other being chapters 113-118.