Force? In what form?
If you're picturing our military manning the border, guns ablaze, cutting down bodies like a machete through sawgrass, that's simply a fantasy that will never happen.
If not that, then what other sort of force? Tear gas and non-lethal high tech crowd control devices? Perhaps, but we've already been told that our military is being deployed to the border to provide tents and logistical support to the Border Patrol.
I'm not trying to pour cold water on your fighting resolve -- I'm just trying to cooly assess this situation in a rational manner. In essence, what's it really going to take to stop the horde?
The fact that they are not an armed force precludes the use of lethal weapons and tactics. That virtually eliminates our military as a useful contingent, so what other options do we have?
I would submit that the most effective way to repel the invaders (under these unique circumstances) is to suspend their 'right' to claim asylum in order to game our system.
Lacking that 'right', there is no way for them to bypass our established law enforcement measures and apparatus. They can be physically apprehended and repatriated to Mexico, or their countries of origin.
This will require the President to issue an immediate executive order, temporarily suspending that 'right'. It's been reported that the President and his advisers are currently considering such a move.
In my mind, it's the surest way to stop the horde in its tracks, and prevent them from melting away into the existing illegal alien population.
That won't work, because a 'rat judge will stay that order long enough for the invaders to invade.
I think President Trump should close the borders down to one lane per location and slow walk the hoards. The lines would back up for 20 miles.
The ensuing cluster would give the Mexican government an incentive to help with the problem.