No he can't just reverse them but even if he could, the border needs to be
funded and an executive order can't do that. It can also be challenged in court. You can't just wait for Trump to do it because he may not win and even if he does, he'll probably lose the majority in the House, which means nothing will get done.
Advocating holding the line means you really don't consider it to be an emergency but only highlights that this is just politics to you.
Mexico is rejecting any effort to reinstate the Trump-era 'remain in Mexico' policy for asylum-seekers.
abcnews.go.com