The phrase "a broad challenge on" is correct and usable in written English.
It can be used when discussing a wide-ranging or significant issue or problem that is being addressed or confronted.
Example: "The organization is facing a broad challenge on climate change that requires immediate action from all stakeholders."
Alternatives: "a significant challenge regarding" or "a wide-ranging issue concerning".
NEW HAVEN — The defense in the Cheshire triple-murder case made a broad challenge to Connecticut's death penalty law on Tuesday, but the judge indicated that he would reject it and that the trial of one of the parolees charged in the killings would begin as scheduled in September.
A number of different renewable and abundant biopolymers (e.g., cellulose, hemicelluloses, lignin, and chitin) are potential starting material for sustainable bioprocesses, but a broad challenge remains on how to efficiently depolymerize these biopolymers to generate monomeric sugars that can be metabolized by industrial microorganisms or other useful building block chemicals.
If successful, however, it could open the way to a broader challenge to City Hall, which sometimes seems intent on turning New York into Amsterdam, or perhaps Beijing.
A federal judge ordered Ohio on Monday to recognize gay marriages on death certificates, but used broad language that could be cited to mount a broader challenge to the law barring such unions.
The idea of the State of the Union as a broader challenge is a reasonable one.
A broader challenge is what to do with these results.
"Groups that are opposing vouchers using every sort of tool that they can," from broader challenges on the nature of public education to technical, state-specific arguments like the one that prevailed on Friday.
Mr. Jones declined to talk about specific recommendations he would make until he starts the job, but commented on the broad challenge he faces, saying, "You grow your digital business and your mobile; it's important to do that, but at the same time, you don't want to neglect the core journalism".
Faced with just such a challenge, the White House unleashed a broad offensive on Wednesday, a mix of muscle and negotiation, in an effort to contain the varying viewpoints within the Democratic Party, split the difference and move forward.
