Sen. Schumer is simply acknowledging the fact that Jews have a deep historical tie, thousands of years old, to the land of Israel. The Palestinian Authority routinely denies Israel's right to exist, and thus don't allow for any serious peace agreement to be reached. I don't defend Chuck Schumer on many things, but he is not wrong in this case.
This.
The Palestinians' tactics is ti incrementally weaken Israel because, at heart, they wish to drive the Jewish State into the sea.
You cannot hope to have a lasting peace with an enemy who, at their core, wishes your total destruction. The demands to give up "occupied territories" aren't demands that, if met, will lead to peace. They are demands that are sought to improve the strategic position of Israel's enemies. Period.
Have the Palestinians ever said, unequivocally, that Israel has the right to exist within their 1967 borders? I haven't heard that yet.