Since taking office, President Trump has signed a flurry of executive orders, but, according to insiders who spoke with Politico, many will face significant roadblocks during implementation.

Since taking office, President Trump has signed a flurry of executive orders, but, according to insiders who spoke with Politico, many will face significant roadblocks during implementation. 
According to the sources, numerous agencies and lawmakers responsible for carrying out a number of the plans were not consulted.  
Now that they have been made aware of the directives, there is a great deal of doubt about some of the orders’ plausibility and, in some cases, legality. 
For example, the building of the wall on the U.S.-Mexico border could begin, but securing the roughly $20 billion needed to complete it would require Congressional action. 
Rebooting the Keystone XL pipeline project is another endeavor that requires much more than the stroke of a pen to accomplish, notes the Fiscal Times.
There are myriad factors involved that reportedly were not vetted, including whether TransCanada, the pipeline builder, would agree to revised construction stipulations. 
Notably, the decision to halt the project came after years of research and consideration. 
Governing through executive orders has been a point of contention for some time, and among those vocally opposed to former President Obama’s use of the means was Trump himself.
The new president now has detractors of his own. 
CNN notes, "What he's doing this week requires a pen and not much more...Congress and the courts will both have their say on how to pay for these things. Less than a week into the Trump era, he has not yet been required to stare down a tectonic government bureaucracy that slows all proposals."