They can not...
Yes they can. The 1976 National Emergencies Act, modified again in 1985, says so.
National Emergencies Act - Wikipedia
That's the law of the land. You being ignorant about it doesn't change it. Your devout wish to have a Stalinist dictator as president doesn't change it.
Either chamber of congress can hold a vote to rescind the declared emergency.
The other chamber then has to hold a vote within two weeks.
If it passes both house and senate, it then goes to the president, who can veto it like any other law, and then that veto can be overridden like any other law.