Nomination His, Romney Steps Up Attack on Obama

By JEFF ZELENY and JIM RUTENBERG

Justin Sullivan/Getty Images

Mitt Romney greeted supporters, including one considerably shy of voting age, at a campaign rally Tuesday in Craig, Colo.

Mitt Romney, who formally secured the Republican presidential nomination on Tuesday, is unleashing an offensive to further undermine confidence in President Obama.

Mitt Romney and his wife, Ann, with Donald Trump in February in Las Vegas for an endorsement announcement.

Romney, on His Big Day, Finds Himself Upstaged

By ASHLEY PARKER

Mitt Romney expected to spend Tuesday at last formally claiming the Republican nomination, but instead he found himself fending off questions about comments made by Donald Trump.

Romney Calls for Action on Syria, but His Party Is Divided

By MARK LANDLER

Mitt Romney criticized President Obama’s opposition to arming Syrian rebels. Some Republicans share that reluctance, while others want to go further, urging airstrikes.

A Measure of Change

President Obama in the Oval Office with Thomas E. Donilon, left, the national security adviser, and John O. Brennan, his top counterterrorism adviser.

Secret ‘Kill List’ Proves a Test of Obama’s Principles and Will

By JO BECKER and SCOTT SHANE

President Obama has placed himself at the helm of a top secret process to designate terrorists for kill or capture, reserving the final say on approving lethal action, say current and former aides.

Texas Runoff Set in G.O.P. Race for Senate

By MANNY FERNANDEZ

In the race for the seat being vacated by Senator Kay Bailey Hutchison, Lt. Gov. David Dewhurst failed to win enough votes in the Republican primary to avert a runoff with Ted Cruz, a Houston lawyer.

Justices Reject Appeal Seeking Payments for Ex-Iran Hostages

By MATTHEW L. WALD

After the Supreme Court’s decision not to hear their plea for compensation, the former hostages are hoping that Congress will act.

Drug Maker Seeks Protection Within Bill Favoring Generics

By ROBERT PEAR

A lobbying effort by Endo Pharmaceuticals led to language in a House measure requiring the F.D.A. to develop new ways of measuring the equivalence of “locally acting” generic and brand-name medicines.

President Obama was seen in silhouette on the Vietnam Veterans Memorial Wall in Washington as he spoke on Monday.

Obama Begins Commemoration of Vietnam Era

By PETER BAKER

President Obama’s speech at the Vietnam Veterans Memorial Wall on Monday started a nationwide anniversary project planned to last 13 years.

The Caucus

In New Ad, Brown Focuses on Accentuating the Positive

By KATHARINE Q. SEELYE

Senator Scott P.Brown took a more positive approach after some negative attacks in the Massachusetts Senate race.

In her book, the first lady writes that she produced only five pumpkins in three years.

Michelle Obama Reveals How Her White House Garden Grows

By MARIAN BURROS

The first lady’s new book, “American Grown,” details how her garden on the South Lawn inspired her anti-obesity campaign.

The Caucus

Mitt Romney and John McCain appeared at a Memorial Day tribute outside the Veterans Museum and Memorial Center in San Diego.

On Memorial Day, Romney and McCain Appeal to Enthusiastic Veterans

By MICHAEL BARBARO

At an event with Senator John McCain, Mitt Romney warned veterans to avoid putting America “on the pathway of Europe” by reducing the size of the military to pay for social programs.

Political Memo

President Obama paused during a trip last week to meet Archie Hackney, a World War II veteran, in Newton, Iowa.

Obama Finds Campaigning Rules Clock

By PETER BAKER

Running like a challenger, President Obama is increasingly consumed by a campaign that is shaping his schedule, his message and many of his decisions.