The phrase "a persistent line of" is correct and usable in written English.
It can be used to describe a continuous or ongoing series of thoughts, arguments, or behaviors.
Example: "There has been a persistent line of questioning regarding the effectiveness of the new policy."
Alternatives: "an ongoing series of" or "a continuous thread of".
A persistent line of questioning by Republican lawmakers concerned the initial comments from Ms. Rice that the attack might have resulted from a protest, over an anti-Islamic video, that spun out of control.
The nuclear issue is likely to be the dominant policy issue in Perth, and the SNP has long deployed it to outflank Labour on the left; it's not actually a hugely salient issue for the average voter, but Scottish Corbynistas are itching to close down a persistent line of nationalist attack.
One persistent line of questioning raised the prospect that the court will sidestep a decision on the basis that the plaintiffs – the proponents of the gay-marriage ban – do not have legal standing to bring the case after the state of California declined to do so when the referendum result was overturned by a federal court.
But it was Dietzen who opened up the most persistent line of questioning, zeroing in on the Coleman team's "offer of proof" — a stack of hundreds of photocopied absentee-ballot envelopes.
The persistent line of questioning for Cashman dealt with the perception of the Yankees as a creaking vessel filled with aging legacy players: Derek Jeter (36), Mariano Rivera (41 in November), Jorge Posada (39) and Andy Pettitte (38).
Another persistent line of criticism might be labelled the "subsystem" worry.
A persistent GOP line of attack against President Obama is that he's inflicted an intolerable "regulatory burden" on American businesses.
The title track's comprehensive pads coupled with Rhome's delicately layered vocals are placed on top of a persistent bass line.
This will be evident as a persistent fracture line on radiograph, continued pain with hip range of motion, and the inability to weight-bear without pain.
Inspired by the Bush campaign's most persistent line, which has been repeated ad nauseum since the start of the summer, this partisan footwear is available in a number of styles.
This was a persistent fault-line in the New Labour years.
