The law isn't being twisted. Read the link I posted earlier in the thread. The law, passed by Congress, leave very few hurdles for a president to clear in order to declare an emergency.
If Congress doesn't like the law, they have the constitutional authority to change it.
'Legal' or not this is deeply immoral. I would argue that the president has the moral responsibility not to abuse the law just because it allows him certain powers.
Congress may very well find one day that declaring an emergency when there isn't one, or by manufacturing one for his own political ends, the president is committing 'high crimes and misdemeanors'. The law also allows for impeachment for just such an eventuality, when the president commits a crime that only a president, by definition can commit.
His other offenses: campaign finance, obstruction, potential collusion, bribery, self-dealing and general skulduggery may be easier to define if it is found he committed such. But impeachment exists for precisely those crimes that only someone holding office, and abusing that office is in a position to commit.
Let's look at the possibilities:
Lying to the people. This goes beyond merely unfulfilled campaign promises, or misrepresenting policies.
Demanding federal funds under false pretenses
Seizing land under imminent domain, under false pretenses
And not to mention the dangerous precedent: remember in future a president might want to declare a state of emergency for something the Right wing doesn't care about. How about climate change? Women's reproductive health? How about forcing states to stop restrictive voter ID laws and registration purges? What about term limits, campaign finance limits, overturning Citizen's United? Protecting press freedoms or claiming down on the proud boys or the KKK? To shut down the government (again), to seize firearms; What if they start rounding up freaking gingers?
This is a good time to make the 'slippery slope argument' because until now no emergency has been declared that was challenged by congress and the people. If the president gets away with it this time, what will he and future presidents use it for?