Spotlight: U.S. Senate's latest push for gun control after Orlando massacre doomed to failure

The U.S. Senate is slated to begin voting on gun control bills on the coming Monday in the wake of the Orlando nightclub massacre. However, the prospect of any bills getting passed looks bleak.

The four competing bills, two Democratic and two Republican proposals, focus on whether to expand background check and to block selling of firearms to anyone on federal government's terrorism watch list.

Democrats insist that the sales of firearms should be blocked if there is a "reasonable suspicion" that someone is and will possibly be on the government's terrorism watch list.

In an even longer shot, Democrats are also seeking a background check for the sales and transfer of guns with a handful of exception, a long-holding stance almost unanimously opposed by Republicans in both chambers.

Currently, purchasing firearms at gun shows and on the Internet does not require any background check in the majority of U.S. states.

On the Republican side, GOP lawmakers are pushing forward a measure that would allow the government to delay a gun sale to a suspected terrorist for 72 hours while attorney generals have to seek a court order within the period to permanently block the sale.

Also, instead of imposing an almost universal background check, Republicans' proposal for expanding background check includes providing incentives to share mental health records.

The Senate's latest legislative effort to curb rampant gun violence comes at a time when the whole country is still reeling from the deadliest shooting massacre in U.S. history.

Forty-nine people were killed and 53 others wounded, on June 12 in a shooting spree at a popular LGBT nightclub in Orlando, Florida. It was also the deadliest terror attack in the history since the 9/11 terror attacks in 2001.

The gunman, identified by authorities as Omar Mateen of Port St. Lucie, Florida, was found dead inside the nightclub after a shootout with the police.

According to investigators, Mateen legally purchased a handgun and an assault-style rifle weeks before the attack. He was temporarily on Federal Bureau of Investigation's terrorism watch list in 2013.

In recent years, after high-profile mass shootings occurred, such as the carnage at Sandy Hook Elementary School in Connecticut in 2012 which claimed 28 lives, including 20 children, Democrats tried but failed each time to reform the country's flawed gun laws.

In 2013, the Obama administration's gun control initiatives, including expanded background checks and bans on assault weapons, were stymied in Congress after staunch opposition from Republican lawmakers and gun-rights lobby groups.

After the shooting spree in San Bernardino, California, last year, in which 14 were killed and 22 more injured, Democrats downgraded efforts to trying to pass a measure to keep people on terrorism watch list from purchasing gun. That legislative effort again failed.

This time, all the four bills to be considered on Monday are required to first gain at least 60 votes to overcome procedural hurdles before heading to debates and final votes. However, it remains remotely likely that any bill could pass procedural Senate vote.

During his presidency, Obama has been confronted with more than a dozen of high-profile mass shootings, and in an interview last year he called the failure to reform U.S. gun laws "one of the greatest frustrations" of his presidency.

"If you ask me where has been the one area where I feel that I've been most frustrated and most stymied, it is the fact that the United States of America is the one advanced nation on Earth in which we do not have sufficient common-sense gun safety laws, even in the face of repeated mass killings," Obama told BBC in July, 2015. Endit