Read Luke 14:28-30 and 31-32 and 33-35.
It speaks of a future time when Israel will not be allowed to complete the building of the Temple, which is the trigger for the nations of the world to come up against Jerusalem, Jesus' subsequent judgement of those nations, and Israel on realising who is leading the Heavenly Army against the nations, immediately seek Jesus' terms for peace.
Evangelical Christians around the world have been pushing for Israel to rebuild the Temple for a third time to hasten the end times along.
However, the clock for the gathering of the nations at Armageddon has already been started by the fulfilment of part of the Sixth Bowl Judgement where the foul frog like spirits went out from the mouth of Satan, the Beast and the False prophet, i.e. the little horn of Daniel 7:1-12, to perform signs and wonders to draw the nations to the time of their judgement at Armageddon.
As Paul informs us in Romans 11:25-26, after the fullness in time of the Gentiles is completed, then after that all of Israel will be saved, without the Temple being built.