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Sen. Mark Kirk, R-Ill., bucked his party on gun control Monday as four separate measures failed to advance in the aftermath of the Orlando, Fla., nightclub massacre.

Kirk and Sen. Dick Durbin, D-Ill., cast identical votes to support Democratic measures and reject GOP-authored language.

Sixty votes were needed to end debate and move to an up-or-down vote on each measure — and a “yes” vote signaled a desire for that. A “no” vote signaled a refusal to allow the measure to come to a vote.

The measure’s lead sponsor is noted.

Republican measures:

(Sen. Chuck Grassley, R-Iowa)

*To notify law enforcement if a person investigated for terrorism in the past five years tries to buy a firearm and to clarify definitions on the mental health prohibition against acquiring and possessing a firearm.

Durbin and Kirk, no.

(Sen. John Cornyn, R-Texas)

*To delay the sale of a firearm or explosives if the buyer has been investigated for terrorism in the past five years. If such a purchase was attempted, the attorney general and federal, state and local law enforcement would be notified — and the sale could be delayed for up to three days to allow for court review.

Durbin and Kirk, no.

Democratic measures:

(Sen. Chris Murphy, D-Conn.)

*To close the “gun show” loophole by requiring a background check for every firearm sale and to ensure all people who should be banned from buying a firearm are listed in the National Instant Criminal Background Check System, or NICS.

Durbin and Kirk, yes.

(Sen. Dianne Feinstein, D-Calif.)

*To allow the attorney general to bar suspected terrorists from buying a firearm and to alert law enforcement if a person suspected of terrorism in the past five years tries to buy a gun.

Durbin and Kirk, yes.

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Twitter @KatherineSkiba