For weeks, Marly Arevalo has had her school transcripts and birth certificate ready. The 20-year-old community college student in Riverdale, Maryland, who immigrated illegally to the U.S. as a young teenager, was all set to apply for deportation relief under President Barack Obama's executive action. Her younger brother and sister, both high school students, were also planning to apply.

But on Tuesday morning, they heard on the radio that the program, scheduled to begin accepting applications Wednesday, had instead been suspended indefinitely. A federal judge in Texas issued a ruling Monday favoring a lawsuit by 26 states that challenged the president's action.

"This is a big disappointment for me and my family," said Arevalo, whose father is a groundskeeper and whose mother cleans offices. "We were all so excited when the president announced the program. . . . It would open so many doors for us to get more education and better jobs. "

For months, illegal immigrants in the Washington region and across the country have been flocking to workshops in Latino communities, eager to learn how to apply for deportation relief under President Obama's action last November. The action could potentially benefit up to 5 million such immigrants, most as parents of U.S.-born children and others as adults who entered the U.S. as youths.

Now, the eleventh-hour court order from Texas has sent their communities into shock -- and sent advocacy groups scrambling to persuade them that all is not lost-- just temporarily delayed.

Gustavo Torres, executive director of CASA of Maryland and Virginia, the largest advocacy and assistence agency for illegal immigrants in the region, said he is positive the Texas ruling will eventually be overturned on appeal by federal officials. Meanwhile, he said, CASA will continue advising applicants to gather their documents and get ready to apply as soon as the program is revived.

"This is a setback for our community but it is by no means the end of the road," Torres said Tuesday. "People are going to be confused, but we will keep having our workshops and tell them don't stop, keep preparing. There are going to be rallies all over the country. This is a political attack, but we have the legal and political means to fight back. "

Immigrant organizations and advocacy groups across the country said Tuesday that the Texas ruling did not come as a surprise, and that they expected federal officials to quickly appeal it with a high likelihood of success. They said they were working with Spanish-language radio and TV to get out the word that the ruling is not permanent and that potential applicants should not panic.

In Los Angeles, where a team of lawyers at the National Immigration Law Center have been gearing up to help applicants for the executive action, managing attorney Karen Tumlin said all applicants are now being told to "proceed calmly about the business of getting ready" -- gathering documents and cash for application fees -- but to also be wary of shady individuals posing as lawyers who may try to take advantage of their fear and confusion."

Frank Sharry, executive director of the national pro-immigrant group America's Voice, dismissed the court ruling as part of a strategy by Republican opponents of Obama and immigration reform to "introduce as much controversy and uncertainty as possible, so fewer people will apply.," he said.

Immigration officials had also been preparing for months for an expected onslaught of applicants, with plans to hire an extra 1,000 private contractors in a newly leased building in northern Virginia, at a cost of about $48 million, to process their cases as applications packages arrive by mail. The website of the U.S. Citizens and Immigration Service has posted numerous general guidelines for applicants.

But the detailed rules had not yet been issued, leaving the planned rollout already marred by confusion about eligibility requirements and open to charges from Congressional critics that the new policy was being used to "sneak" others onto a path to permanent residency and citizenship.

At orientation workshops across the Washington region this past month, Latino families besieged counselors with questions about what was needed to qualify -- and in many cases, they were not yet able to answer.

Most such questions came from parents who sought to qualify through their U.S.-born or legal resident children, who constitute well over 4 million of the estimated 5 million illegal immigrants who may apply for deportation relief. Their applications, however, were not scheduled to be accepted until May, allowing more time for clarification.

More urgent were questions raised about the smaller number of adults who came to the U.S. illegally as youths -- whose applications the government was planning to begin accepting on Wednesday.

U.S. Rep. Robert Goodlatte, R-Va., who chairs the House Judiciary Committee complained that immigration officials planned to allow all such applicants to immediately apply for permission to travel to their homelands -- a process known as "advance parole." In an open letter, Goodlatte charged that granting someone advance parole could eventually allow them to become a permanent legal resident, and that the Obama administration was using it to "sneak" more illegal immigrants into the citizenship line.

Immigration officials have not responded to that charge, and on Tuesday Goodlatte said he was "pleased" that the executive action had been temporarily halted, saying, "we cannot allow one man to nullify the law of the land with . . . a stroke of his pen."