Protests against the Dakota Access Pipeline have gone on for months. On Tuesday, opponents of the oil link are going nationwide with at least 153 rallies around the nation.
Protesters aim to convince President Obama to stop or re-direct the pipeline before President-elect Donald Trump takes office. Obama said he might re-route the pipeline. Trump has vowed to restart work on the project within his first 100 days in office.
Our fight has gotten a lot harder, but it actually makes us stronger. This is our time to put pressure on President Obama.
One of the demonstrations will be led by activist Robert Kennedy Jr. in Standing Rock, North Dakota, the heart of the protests.
Today has been dubbed "Day of Action" by protesters.
WATCH | Opponents of the pipeline say police have been unnecessarily violent shutting down protests in North Dakota. In one instance, police threatened to arrest protesters as they prayed. In September, Amy Goodman, host of "Democracy Now!" was charged with rioting as she covered the protests.
One supporter compared the police response to international war.
Here's a flyer advertising a protest in Los Angeles.
On Monday, the Army Corps of Engineers delayed work on an easement for the pipeline and invited the Standing Rock Sioux -- the main tribe living on the Standing Rock Indian Reservation straddling both North and South Dakota -- to talk about on how the work might affect them. Environmental group EarthJustice saw this as a victory.
Shailene Woodley, who was arrested during a protest, joined the call to action.