Longstanding Senate rules say Roberts, as the presiding officer, may rule on key issues about evidence, including "questions of relevancy, materiality, and redundancy."
The timing raises new questions about the Trump administration's stated justification for taking out the top Iranian general.
Trump has lobbed fresh attacks at Sanders on Twitter, at a recent rally and in campaign emails.
The first-in-the-nation voting is just weeks away. There's a crowd of candidates bunched at the top of the field.
"Bernie knows me and has known me for a long time," Warren told NBC News.
Trump will "be impeached forever," Pelosi told ABC's "This Week."
"I didn't see one with regard to four embassies," Esper said of evidence leading to Trump's conclusion. "What I'm saying is I shared the president's view."
Most countries do not have a great deal of faith in Trump when it comes to managing international relations, particularly compared to other world leaders.
Federal regulations on water use in bathrooms and kitchens have caught the president's ire. Some conservatives have long held a grudge about the restrictions.
"The real extremists want revolutionary change rather than evolutionary change, and the vast bulk of the public does not want that," the Democratic presidential candidate said.
John Kerry's defense of Joe Biden comes as Sen. Bernie Sanders has recently escalated his attacks on the former vice president over the Iraq War.
Opponents of the ERA say the deadline for states to ratify the 28th Amendment expired in 1982, and that advocates need to restart the process.
The Vermont senator has seen a comeback since his heart attack and pulled slightly ahead in what remains a tight race.
A team of election security experts used a "Google for servers" to challenge claims that voting machines do not connect to the internet and found some did.
Both backers and foes of the White House position attribute the unexpected support for refugees to the influence of religious groups, especially evangelical leaders.
"I just have such respect for the queen. I don't think this should be happening to her," the president told Fox News.
There's a chance the proceedings could be taking place at the same time Democrats in Iowa are voting on who they want to replace the president.
Collins refused to say how many GOP senators she's working with, but said "I am hopeful that we can reach an agreement" to proceed with Trump's trial.
The self-help author struggled to be taken seriously in the crowded Democratic field, but her colorful debate performances went viral.
Pelosi has been facing pressure from within her party and Senate Republicans to send over the articles of impeachment to being the trial.
"As long as Iran's outlaw ways continue, we will continue to impose sanctions," Secretary of Mike Pompeo said.
First Read is your briefing from "Meet the Press" and the NBC Political Unit on the day's most important political stories and why they matter.
In an exclusive interview with NBC's "Today," the 2020 candidate cast doubt on Trump's claims that a top Iranian general was planning imminent attacks.
Exclusive: The former New York City mayor plans to continue paying hundreds of staffers and funding his digital operation to defeat Trump even if he's not the nominee.
Trump in November dismissed charges against Matt Golsteyn in November.
New surveys in South Carolina and Nevada show that the billionaire philanthropist has met the polling threshold to appear in next week's debate in Iowa.