See the article at https://palwatch.org/page/36977 Abbas Lies! To the US: I’ll stop Pay-for-Slay; to PLO leaders: I won’t deduct a penny
Ideally we should fight them. When that option is not available, expulsion is the 2nd best option.
There is a Biblical Curse Against Israel for Refusing to Fight Them or Expel Them
The Biblical Curse As Explained By Ohr Hachaim Hakadosh
The Biblical Curse in Bamidbar/Numbers 33 as explained by Ohr Hachaim Hakadosh:
33:55
ואם לא תורישו את יושבי הארץ, “And if you will fail to drive out the inhabitants of the land, etc.” According to Megillah 10 which says that wherever the word והיה occurs it alludes to something joyful, the meaning of the word here would be that although the reason the Israelites would decide {with joy} to allow some of these inhabitants to remain for the performance of menial duties, etc., i.e. in order to enjoy their services, G-d would see to it, that instead, these remaining inhabitants would prove to be thorns in their eyes and pricks in their sides and that these foreigners would harass the new owners.
וצררו אתכם על הארץ, “and they shall harass you in the land, etc.” The Torah means that not only will they harass you in the part of the land that you did not drive them out of, but they will harass you even in the parts of the country which you have conquered and driven them out of and which you have settled. They will challenge you to leave what they consider to be their country. The meaning of the word על in this context is similar to Numbers 20,24: על אשר מריתם את פי, “because you have rebelled against My word.” We have a similar meaning of the word על in Deut. 32,51.
33:56
כאשר דמיתי לעשות להם, “as I meant to do unto them, etc.” My commandment was meant for your benefit. Seeing you have not fulfilled it, My commandment remains unfulfilled; I therefore have no choice but to fulfill it in respect of these people you have left in the land.
Note: Elsewhere in his commentary, Ohr Hachaim indicates that the curse is not limited to the situation where Canaanites are left in parts of Biblical Israel.