In case you thought we didn’t have enough national security problems. “Canadian authorities have arrested two men accused of planning to carry out an al Qaeda-supported attack against a passenger train traveling between Canada and the United States . . . .The two men are charged with ‘receiving support from al Qaeda elements in Iran’ to carry out an attack and conspiring to murder people on a VIA railway train in the greater Toronto area.”

In case you thought it impossible for Republicans to lose a South Carolina House seat. “Former South Carolina Gov. Mark Sanford’s (R) bid for a political comeback has been badly damaged by allegations he trespassed at his ex-wife’s home, a new poll suggests. Sanford trails Democrat Elizabeth Colbert Busch by 9 points — 41 percent to 50 percent — ahead of the May 7 special election in South Carolina’s 1st Congressional District, found the survey from Public Policy Polling, a Democratic firm.”

Mark Sanford-Washington Post Mark Sanford-Washington Post

In case you thought Canada was the only Iranian operation. “Iranian using fake Israeli passport nabbed in Nepal.”

In case you thought gun control was still popular and a path to citizenship is not. A new poll says otherwise: “Four months after the shooting rampage at Sandy Hook Elementary School, a USA TODAY Poll finds support for a new gun-control law ebbing . . . Americans are more narrowly divided on the issue than in recent months, and backing for a bill has slipped below 50%, the poll finds. By 49%-45%, those surveyed favor Congress passing a new gun-control law. . . . On immigration, support for taking action is strong: 80% back ‘better border control’ and 71% favor creating a pathway to citizenship for immigrants now in the United States illegally, if they meet certain requirements. Just 25% oppose creating a process to gain citizenship.”

In case you thought conservative media are in lock-step on immigration. Matt Lewis writes, “This bill may not be perfect, but it’s worth reiterating that on several important points — especially those in the enforcement realm which has been of paramount concern to conservatives — it’s more conservative than it could have been — and more conservative than many observers expected it to be, especially in view of President Obama having comfortably won re-election, and Republicans having squandered what was an easy opportunity to retake the Senate.” Read the whole thing.

In case you thought it was easy to classify U.S. citizens as enemy combatants. “Under the AUMF [Authorization of Use of Military Force] as interpreted by the courts, and under the NDAA [National Defense Authorization Act] as passed by Congress, the administration is authorized to hold in military detention only those who are “part of” or “substantially supporting” Al Qaeda, the Taliban, or associated forces. Nothing that has come to light publicly has shown that [Dzhokhar] Tsarnaev was operating as part of any group covered by the AUMF. Unless and until such evidence arises, military detention is not merely a bad idea. It is simply not legally available.” There are other hurdles as well.

In case you thought no one was minding the store. “The FBI was ordered by Congress to carry out an external review of its efforts to combat domestic radicalization less than a month before two ethnic-Chechen terrorists bombed the Boston marathon.”

Jennifer Rubin writes the Right Turn blog for The Post, offering reported opinion from a conservative perspective.