Last week, President Obama announced that he would veto the expected congressional approval of the Keystone XL pipeline. Negative reaction, even by some Senate Democrats, was swift. Sen. Joe ManchinJoseph (Joe) ManchinThe Hill's 12:30 Report — Presented by USAA — Ex-Ukraine ambassador testifies Trump pushed for her ouster GOP requests update on criminal referrals prompted by 2018 Kavanaugh probe Fallout from Kavanaugh confirmation felt in Washington one year later MORE (D-W.Va.), a co-sponsor of the Senate bill, said that he was "extremely disappointed" in the president's announcement. Sen. John HoevenJohn Henry HoevenBottom Line Poll: McConnell is most unpopular senator McConnell ups pressure on White House to get a budget deal MORE (R-N.D.) stated that the president's "veto threat [was] no surprise." Top Senate Republicans, including new Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellFury over Trump Syria decision grows Overnight Defense — Presented by Boeing — Trump to slap sanctions on Turkey for Syria offensive | Trump calls on Turkey to broker ceasefire | Pelosi, Graham seek deal on sanctions | Ex-Trump aide testifies in impeachment probe Trump: Let Assad, Russia or China protect the Kurds MORE (Ky.) and John CornynJohn CornynGOP braces for impeachment brawl Overnight Health Care — Presented by Coalition Against Surprise Medical Billing — Judge blocks Trump 'public charge' rule | Appeals court skeptical of Trump arguments for Medicaid work requirements | CDC offers guidance for treating vaping-related cases GOP requests update on criminal referrals prompted by 2018 Kavanaugh probe MORE (Texas) decried the announcement.

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Why would Obama veto the bill? The White House announced that the president is worried that bill passage would truncate "the thorough consideration of complex issues that could bear on U.S. national interests." Late last year, Obama expressed concern that the pipeline would not lower the price of gas and previously argued that the pipeline would not have the positive impact on jobs that supporters believe. Sen. John ThuneJohn Randolph ThuneImpeachment threatens to drown out everything Republicans show signs of discomfort in defense of Trump   Embracing President Mike Pence might be GOP's best play MORE (R-S.D.) believes that Obama "is listening to his left-wing base." So, perhaps the president is acting on ideology alone.

Some pundits, however, have argued that a veto of the Keystone project would be key campaign fodder for 2016 presidential hopefuls. For example, Paul Bledsoe suggests that "Keystone will now be front and center in the presidential cycle." Is Obama looking forward to the immediate legacy of his administration?

There may be another possible reason why Obama issued a veto threat, especially so early in the 114th Congress. A few years ago, it was suggested that Obama used veto threats "to shame Republicans for their positions and fire up the liberal base." I suggest the he may be participating in "veto bargaining." Although the number of presidential vetoes has diminished in recent presidential terms (Franklin Roosevelt issued 635; Bill Clinton issued 37; George W. Bush issued 12; Obama, thus far, has issued two), the idea of veto bargaining suggests that a mere veto threat may induce Congress to alter its actions. In particular, political scientist Charles Cameron suggests that a veto threat may lead Congress to "anticipate vetoes and modify the content of legislation to head them off," which suggests that the president use the veto to "not only to block legislation but to shape it." Thus, the power of the veto cannot be measured merely in the number issued. It has been noted previously that "Obama has retreated from such threats in the past, citing changes which he said made the earlier measures more palatable if still distasteful to him." I would suggest that rather retreat from the threats, Obama used them to extract concessions from lawmakers.

It appears that Obama's veto threat may very well imperil the bill itself — or at least the likelihood that the Senate GOP can make it "veto proof." Hoeven has stated that the GOP "may not have enough to overcome a veto." Because McConnell has committed to allowing an amendment process, leaders in both parties have proposed amendments that make the bill more palpable to others — including Obama. However, Sen. Chuck SchumerCharles (Chuck) Ellis SchumerTrump defends 'crime buster' Giuliani amid reported probe Louisiana voters head to the polls in governor's race as Trump urges GOP support Trump urges Louisiana voters to back GOP in governor's race then 'enjoy the game' MORE (D-N.Y.), who has a list of suggested amendments that might appeal to the president, has still urged Obama to veto the Keystone bill because he believes Democrats in the Senate could withstand a veto override vote.

Hoeven, though, hopes that the amendment process will be "the key to greenlighting Keystone." There should be concern, however, on the part of Senate Republicans that too much outreach to the Democrats could have the opposite impact. One key Democrat, Missouri's Claire McCaskillClaire Conner McCaskillIranian attacks expose vulnerability of campaign email accounts Ex-CIA chief worries campaigns falling short on cybersecurity Ocasio-Cortez blasts NYT editor for suggesting Tlaib, Omar aren't representative of Midwest MORE, who currently supports the Keystone oil pipeline, said last week that "[i]f Republicans try to 'basically take all power away from the EPA [the Environmental Protection Agency] or do some other really damaging things to the environment through the amendment process, it will be a very difficult decision in terms of final passage.'"

In short, by threatening the veto, Obama may have instigated passage of a bill with enough liberal amendments that he can abide the entirety. Alternatively, he may have begun a process intended to ensure widespread, bipartisan passage that may backfire on Senate Republicans.

Either way, President Obama's veto count might remain at two — but he would weathered his first storm of the 114th Congress.

Gibson is an associate professor of political science at Westminster College in Missouri.