After the shooting rampage in El Paso, allegedly by a man who railed against the “Hispanic invasion of Texas,” even President Donald Trump felt obliged to acknowledge that racism, bigotry and white supremacy are “sinister ideologies” that “must be defeated.” 
Trump was only confirming what law enforcement officials realised long ago: Violent white supremacists pose a major threat comparable to that presented by foreign terrorists and their US sympathisers.
Legislation was introduced in Congress in March that calls for the establishment of domestic terrorism units in the Justice and Homeland Security departments and the FBI. But some have called for a more sweeping new law to ensure that the FBI could investigate domestic terrorism as aggressively as it does terrorism with international connections. Congress needs to proceed cautiously on any such proposals.
Domestic terrorism motivated by racial or religious hatred is undoubtedly a pressing problem. Michael C McGarrity, the FBI’s assistant director for counterterrorism, told the House Homeland Security Committee in May that “there have been more arrests and deaths caused by domestic terrorists than international terrorists in recent years” and that racially motivated extremists were responsible for “the most lethal incidents.”
It’s also true that, while federal law contains a definition of domestic terrorism, there is no statute that makes all domestic terrorism a federal offence with prescribed penalties.
But Congress could run into constitutional problems if it seeks to combat suspected domestic terrorism using the same legal tools employed against foreign terrorist groups. Besides, it’s not clear that the laws already on the books prevent the FBI from aggressively investigating violent white supremacists or other domestic terrorists, or that they unduly hamper the US Justice Department in prosecuting them.
David Cole, the legal director of the American Civil Liberties Union, told The New York Times that proposals for a new domestic terrorism law “tend either to be duplicative of laws that already exist or expansive in ways that violate 1st Amendment rights of speech and association.” An analysis by the Brennan Centre for Justice at New York University Law School notes that “there are already dozens of federal statutes carrying severe penalties that are available to investigators and prosecutors pursuing these crimes.”
Those who are calling for a new domestic terrorism statute say there are still gaps in federal law. If so, Congress should figure out what they are in a deliberative way.
But Congress needs to recognise that some approaches to the investigation of foreign terrorism raise constitutional questions when applied to domestic activities. 
Some advocates of new legislation admit that their purpose is to send a message that Congress and the nation deplore terrorist acts by white nationalists as much as they do acts of violence committed by foreign extremists. That is an important message, and one that Trump has been shamefully slow to embrace. But legislation is about more than symbolism; it has practical consequences.
The best way to demonstrate that the federal government is serious about terrorism by white nationalists, anti-Semites and other bigots is for the Justice Department and the FBI to make full use of the ample authority they already have. – Tribune News Service
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